Maybe i misunderstood but i don't see anything that implies complete love only comes after resurrection. Both passages (1 Cor 13 & 1 John 4) are talking about being perfected in love here on earth.
1 Cor 13:
1If I speak in the tongues
a of men or of angels, but do not have love, I am only a resounding gong or a clanging cymbal.
2If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love, I am nothing.
3If I give all I possess to the poor and give over my body to hardship that I may boast,
b but do not have love, I gain nothing.
4Love is patient, love is kind. It does not envy, it does not boast, it is not proud.
5It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs.
6Love does not delight in evil but rejoices with the truth.
7It always protects, always trusts, always hopes, always perseveres.
8Love never fails. But where there are prophecies, they will cease; where there are tongues, they will be stilled; where there is knowledge, it will pass away. 9For we know in part and we prophesy in part, 10but when completeness comes, what is in part disappears. 11When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I put the ways of childhood behind me.
12For now we see only a reflection as in a mirror; then we shall see face to face. Now I know in part; then I shall know fully, even as I am fully known.
13And now these three remain: faith, hope and love. But the greatest of these is love.
1 John 4:
7Dear friends, let us love one another, for love comes from God. Everyone who loves has been born of God and knows God.
8Whoever does not love does not know God, because God is love.
9This is how God showed his love among us: He sent his one and only Son into the world that we might live through him.
10This is love: not that we loved God, but that he loved us and sent his Son as an atoning sacrifice for our sins.
11Dear friends, since God so loved us, we also ought to love one another.
12No one has ever seen God; but if we love one another, God lives in us and his love is made complete in us.
13This is how we know that we live in him and he in us: He has given us of his Spirit.
14And we have seen and testify that the Father has sent his Son to be the Savior of the world.
15If anyone acknowledges that Jesus is the Son of God, God lives in them and they in God.
16And so we know and rely on the love God has for us.
God is love. Whoever lives in love lives in God, and God in them. 17This is how love is made complete among us so that we will have confidence on the day of judgment: In this world we are like Jesus. 18There is no fear in love. But perfect love drives out fear, because fear has to do with punishment. The one who fears is not made perfect in love.
19We love because he first loved us.
20Whoever claims to love God yet hates a brother or sister is a liar. For whoever does not love their brother and sister, whom they have seen, cannot love God, whom they have not seen.
21And he has given us this command: Anyone who loves God must also love their brother and sister.