for the benefit of those of want to see an 85/1.4 versus 85/1.4 comparison, I will provide a link here and see and judge it for yourselves.
here's the link:
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Nikkor_Polar_Review (JSVFOTO)
I know it's not a Pentax 85 but a Nikkor lens is used as a comparison against the 3rd Party 85, but atleast we have an idea on how this lens perform in general. though I must say that I'm also interested in comparing a Pentax 85 against a 3rd Party 85 as well. but anyways, if we are going to use other past data of a Nikkor 85 versus Pentax 85 shot comparisons as on how they perform against each other, we could use those as reference on where the 3rd party lies between the 2 other lenses (make it 3 for the Canon) and how the 3rd party 85 performs by virtue of comparison between Nikkor versus Samyang and Nikkor versus Pentax.
btw, the results show that the Nikkor lens is brighter than the Polar, but the the Polar is much more sharper than the Nikkor at wide open. so it depends how you compensate or manage for brightness for the Polar and sharpness for the Nikkor lens. so it's a matter of working out the lens. btw, just to remind you that I'm familiar with the Nikkor 85, and I could attest to it's sharpness. but I wouldn't deny the fact and basing from that comparison that indeed the Nikkor got beat in terms of sharpness by the Polar. that's why the lens caught my attention and got intrigued by it. if there are any questions with regards to bite (sharpness of the lens), I'm sure you'll find a lot of posted photos everywhere on the net, particularly at DPR where people could attest to that and have photos to show as well. sorry I just got lazy from posting the links so you might want to browse it yourselves.
with regards to the shallow DOF of the Samyang at wide open that Marc had mentioned, I think this is where shooting LV (magnified) mode comes in handy. having the K-7 is a luxury I were to say it if you got that particular lens. not to mention that having a better focus split screen and magnifier is also of a major assistance.