Since you have asked for evidence, I will present the evidence from the textual scholar who actually collated all the Gospels and compared the difference between the Received Text (the standard basis of comparison) and the manuscripts promoted as “the best” by critics since the time of Westcott & Hort.
So I am quoting directly from The Revision Revised by John William Burgon, which spells out everything. It should be noted that the following symbols are used for the manuscripts in question: Aleph = Codex Sinaiticus, A = Codex Alexandrinus, B = Codex Vaticanus, C = Codex Ephraemi Rescriptus, D = Codex Bezae. It should also be noted that textual corruption means (1) omissions, (2) additions, (3) transpositions, (4) substitutions, and (5) modifications.
1. THE FOUNDATION OF SOUND TEXTUAL CRITICISM IS PRESENTED
In Textual Criticism then, “rough comparison” can seldom, if ever, be of any real use. On the other hand, the exact Collation of documents whether ancient or modern with the received Text, is the necessary foundation of all scientific Criticism. I employ that Text,—(as Mill, Bentley, Wetstein; Griesbach, Matthæi, Scholz; Tischendorf, Tregelles, Scrivener, employed it before me,)—not as a criterion of Excellence, but as a standard of Comparison. (page xxv)
We deem it even axiomatic, that, in every case of doubt or difficulty supposed or real—our critical method must be the same: namely, after patiently collecting all the available evidence, then, without partiality or prejudice, to adjudicate between the conflicting authorities, and loyally to accept that verdict for which there is clearly the preponderating evidence. The best supported Reading, in other words, must always be held to be the true Reading: and nothing may be rejected from the commonly received Text, except on evidence which shall clearly outweigh the evidence for retaining it. (pp 20,21)
2. THE COMBINED VERDICT OF ALL DOCUMENTARY EVIDENCE IS REQUIRED
The method I persistently advocate in every case of a supposed doubtful Reading, (I say it for the last time, and request that I may be no more misrepresented,) is, that an appeal shall be unreservedly made to Catholic Antiquity; and that the combined verdict of Manuscripts [copies], Versions [translations], Fathers [patristic quotations], shall be regarded as decisive. (p xxviii)...[Also] To specify one single consideration, which has never yet attracted nearly the amount of attention it deserves,—“Lectionaries” abound, which establish the Text which has been publicly read in the churches of the East, from at least A.D. 400 until the time of the invention of printing. (p 37)
Happily, our MANUSCRIPTS are numerous: most of them are in the main trustworthy: all of them represent far older documents than themselves. Our VERSIONS (two of which are more ancient by a couple of centuries than any sacred codex extant) severally correct and check one another. Lastly, in the writings of a host of FATHERS,—the principal being Eusebius, Athanasius, Basil, the Gregories, Didymus, Epiphanius, Chrysostom, the Cyrils, Theodoret,—we are provided with contemporaneous evidence which, whenever it can be had, becomes an effectual safeguard against the unsupported decrees of our oldest codices, Aleph A B C D, as well as the occasional vagaries of the Versions. In the writings of Irenæus, Clemens Alex., Origen, Dionysius Alex., Hippolytus, we meet with older evidence still. No more precarious foundation for a reading, in fact, can be named, than the unsupported advocacy of a single Manuscript, or Version, or Father; or even of two or three of these combined. (p 19)
3. THE CORRUPTIONS OF THE MINORITY TEXT ARE MANY
We speak of codices B or Aleph or D; the IXth-century codex L, and such cursivesas 13 or 33; a few copies of the old Latin and one of the Egyptian versions (p 20). Yet do they stand asunder in every page; as well as differ widely from the commonly received Text, with which they have been carefully collated. On being referred to this standard, in the Gospels alone, B is found to omit at least 2877 words: to add, 536: to substitute, 935: to transpose, 2098: to modify, 1132 (in all 7578):—the corresponding figures for Aleph being severally 3455, 839, 1114, 2299, 1265 (in all 8972). And be it remembered that the omissions, additions, substitutions, transpositions, and modifications, are by no means the same in both. It is in fact easier to find two consecutive verses in which these two MSS. differ the one from the other, than two consecutive verses in which they entirely agree. But by far the most depraved text is that exhibited by codex D. “No known manuscript contains so many bold and extensive interpolations. Its variations from the sacred Text are beyond all other example.” (p 13)...the deflections from the Received Text thus amounting in all to 13,281 (p 14).
What we are just now insisting upon is only the depraved text of codices Aleph A B C D,—especially of Aleph B D. And because this is a matter which lies at the root of the whole controversy, and because we cannot afford that there shall exist in our reader's mind the slightest doubt on this part of the subject, we shall be constrained once and again to trouble him with detailed specimens of the contents of B, &c., in proof of the justice of what we have been alleging. We venture to assure him, without a particle of hesitation, that Aleph B D are three of the most scandalously corrupt copies extant:—exhibit the most shamefully mutilated texts which are anywhere to be met with:—have become, by whatever process (for their history is wholly unknown), the depositories of the largest amount of fabricated readings, ancient blunders, and intentional perversions of Truth,—which are discoverable in any known copies of the Word of GOD. (p 16)
4. CODEX SINAITICUS (ALEPH) IS THE MOST UNTRUSTWORTHY
—Next to D, the most untrustworthy codex is Aleph, which bears on its front a memorable note of the evil repute under which it has always laboured: viz. it is found that at least ten revisers between the IVth and the XIIth centuries busied themselves with the task of correcting its many and extraordinary perversions of the truth of Scripture. (p 14)
5. THE OLDEST MANUSCRIPTS ARE THE MOST CORRUPT NOT "THE BEST"
Quoting Scrivener: “It is no less true to fact than paradoxical in sound,” writes the most learned of the Revisionist body [Scrivener], “that the worst corruptions, to which the New Testament has ever been subjected, originated within a hundred years after it was composed: that Irenæus [A.D. 150] and the African Fathers, and the whole Western, with a portion of the Syrian Church, used far inferior manuscripts to those employed by Stunica, or Erasmus, or Stephens thirteen centuries later, when moulding the Textus Receptus.” (pp 30, 31)
6. WESTCOTT & HORT USED DECEPTION IN ALTERING THE BIBLE
But instead of all this, a Revision of the English Authorised Version having been sanctioned by the Convocation of the Southern Province in 1871, the opportunity was eagerly snatched at by two irresponsible scholars of the University of Cambridge for obtaining the general sanction of the Revising body, and thus indirectly of Convocation, for a private venture of their own,—their own privately devised Revision of the Greek Text. On that Greek Text of theirs, (which I hold to be the most depraved which has ever appeared in print), with some slight modifications, our Authorised English Version has been silently revised: silently, I say, for in the margin of the English no record is preserved of the underlying Textual changes which have been introduced by the Revisionists. (p. xxx)