As I wrote in another thread, I've been having a bit of a lens upgrade debacle. I was thinking about getting a couple of primes and an ultrawide to replace my Tamron 28-75. But most of the 30ish primes are either not better than the Tamron 28-75 (Sigma 30mm f/1.4 and Canon 35mm f/2) or cost more than I'm prepared to spend right now (35L).


I have seen a couple of used Canon 28-70 f/2.8Ls that I could probably afford if some other pieces fall into place...I've used the 24-70L, and it's a huge step up from the 28-75...how does the 28-70 compare in terms of sharpness, contrast, and flare resistence? I know the 28-70 isn't going to be on par with L primes, but if it's on par with consumer primes, it might be the right option for me...