[Rover]

Frank, thanks for posting.

 

Bulky, you're saying? Any design suggestions, how Sigma can get the constant f/4 into a smaller tube? Pass it forward to them...  But I have to say, I don't want to re-buy my 77mm filters for 82mm, so that's a dealbreaking thing for me, too. As for weak corners: Apparently not that much weaker than the genuine lenses, when comparing PZ results of 24-85 and 24-120/4 VR.

 

Also, not everybody's a friend of extending tubes. Anyway, I'll save my money for a 85/1.4 in the quality level of their 35/1.4 

In the Canon land, 82mm is already the new 77mm. 2 of 3 lenses in the current Zoom trinity have this filter size, as does the 24/3.5 TS-E.

For me, the A designation is kinda odd on this lens... should be a C. But the latter category does seem underused in favour of A... the 2.8 mirrorless primes should have been in the C as well, since they're cheap and not exceedingly fast for the FLs.