btw, i went to the shop & i can tell you that the leather is really soft. its so much different from the other k-leather boots.
[/quote]
I own both copa and f50. Let me break down some aspects of both boots for u.
Size/fitting : My copa is uk7.5/j260 and f50 uk8.5/j270. Copa seem to have smaller sizing. My copa fits like a T when I wear thin socks and a bit tight with thick socks but still ok. For F50, i'll need to wear thick socks, I sometimes regretted not getting half a size smaller, but i remember having difficulty slotting into the half size smaller one bcos of the restriction at the opening by a not so elastic band, when I did slot in, it actually felt tight. Eventually I settled for uk8.5.
Feel/comfort : Prob bcos of the size i got for F50, i actually feel that the front is wide, I have no complain from heel to before toes, but toes onwards, it's a bit loose. For copa with thin sock, the fitting is good. F50 has thicker cushion under the leather compared to copa, if u are one player who needs to 'Feel' the ball, copa is beta. I'm a central mid, copa gives me more 'feel' when i distribute those diagonal passes. My passes can actually go further with copa. F50 has a thicker tip than copa, as such 'chip passes' are easier with copa.
Durability : My copa shows sign of 'crocodile jaw' after just 1-2 months, I was disappointed. It could be due to the way I clean it after game, I remembered it was rainy season then, I had to wash it with brush instead of cleaning it with damp cloth, after it dried, I use kiwi wax to condition them. My attempts to glue it with sneaker glue actually aggravate it. The tip of the white plastic sole does not curl up as much as F50,in my opinion, it makes it easier to open up. Anyway, the right toe portion of my F50 too open up after 3 months. I wish adidas do a perimeter stich for their boots with lotto did for their stadio. Perhaps, its the way I clean and condition my boots.
I hope my experience can help u to make the correct choice.