Right now I have 50d + kit 18-55 (useless thing) + 50 1.4.
I've got two ways now:
1. Sell 50d + kit and buy 5d mark ii
2. Or to buy 35L or 24L or 50L (they almost the same budget) for my 50d
I'm confused, what is better way to go, good lens and crop or not so good lens and full frame?
Using L primes on crop bodies is a waste, crop sensor uses less than half of that precious glass and that's where the quality comes from (size matters). Those are made for FF
. My advice - go for 5D2. I'd choose 5D2+50/1.8II over 50D+35L or 5D2+85/1.8USM over 50D+50L (or 5D2+135L over 50D+85LII) any day.
+ I will have money enough for someting like 35 f/2
50/1.4USM is a very nice lens on FF, but I don't recommend the 35/2. IMHO it's pretty bad on FF at f/2-2.8 (too soft + vignetting) and at 2.8+ it's barely better than a zoom lens. I'm going to try the Samyang 35/1.4UMC, that is a beautiful piece of glass (fully manual though).
...and EF 28-135 IS USM is a decent budget zoom for FF, if you need one.