What's all this talk of CAs ? You guys don't know your DxO. In their wonderfully condensed measurement rankings the 85 f1.8 has less CAs that all the rest.More specifically I meant purple fringing, and from the sound of it, I must've had a really lousy copy.
OK so they test in the dark, but hey so what !? It's a 1.8 lens.
Not just you, the copy I had was the same. F/2.8 and above was better.
I was poking fun at DxO. Everyone knows that the 85 1.8 as really bad CAs wide open in bright light, yet on the DxO lens 'scores' it has one of the least CA of any lens. In fact for a long time the 85 1.8 was the highest placed of any Canon lenses !!!
However those CAs are the result of the lens's smooth brokeh - which is also why it isn't a critically pin sharp lens ( in theory - it is in practice ). Nowadays the lens manufactures seem to be able to give good brokeh without too much CA and loss of resolution, so maybe an series two version will be interesting - but it will be more expensive too.
Also neither the review or anyone else has mentioned what I suspect is a big failing of the lens. I'm not at all sure that the focusing mechanics of this lens is able to keep up with the very shallow DoF when at a moderate distance at f1.8. In this area the 135L is definitely more reliable.