pwp said:
I foolishly sold a very good EF 50 f/1.4 and replaced it with the well reviewed Sigma 50 F/1.4. When it nailed focus it was fantastic, but the AF was so inconsistent that the lens couldn't be trusted and sat unused.
But a new Sigma 50 as good as the new 35? That would be interesting and would likely sell its socks off. Personally I wouldn't get one or any other prime in the 24-70 range because the new EF 24-70 f/2.8II has rendered every prime in that range obsolete for the way I shoot. I've sold my Sigma 50 f/1.4, my 24 f/1.4II and if I had a 35 that would be gone too. The new zoom is amazing and primes just sat unused.
But that's just me. There is a huge market for stellar primes and an update from Sigma would be a welcome big seller.
-PW
Let's not forget that Sigma is likely to update
their 24-70 f/2.8 to fit under their new company model. If they stick up with their "L Glass Killer" releases, a lens like that might be, likewise, more worth getting than any of their primes in that range.