Apologies if this has already been discussed, but I couldn't find anything via search. I'm currently shooting an A99. I was (may still be) going to audition some new glass for the A99 but I'm now considering jumping to the A7R. One of the lenses I had on my 'go rent this' list was the Sigma 35/1.4 Art series piece. Are any of you A7R users using this lens? Love it? Hate it? Have something better/comparable that you prefer in a 35?