Talley wrote in post #18685937
I’m not a big fan of my 85GM. It’s perfect size and feel and love the colors but wide open is eh
I'de get the GM all day, the size is a major factor, and IQ isn't as straight forward as pure sharpness. The sigma art is the sharpest available, no doubt, and it's pretty clear that even the 135 I use is sharper than the GM... but if I can save the 400g for the GM version, that's a mid size lens right there!
I have slightly lower standards for IQ, something like the 85 f1.8, and I'm happy. If it's blistering sharp wide open, great, but I don't want to deal with the weight/size penalty. Sigma lenses are so sharp because of the oversized elements that mimic medium format lenses basically.
A native 135, tightly engineered lens would have me considering a switch from the optically super 135A. Luckily, I don't use the lens often, so it doesn't annoy me very much.
Sony A7siii/A7iv/ZV-1 - FE 24/1.4 - SY 24/2.8 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - F 600/5.6 - CZ 100-300 - Tamron 17-28/2.8 - 28-75/2.8 - 28-200 RXD
Panasonic GH6 - Laowa 7.5/2 - PL 15/1.7 - P 42.5/1.8 - OM 75/1.8 - PL 10-25/1.7 - P 12-32 - P 14-140