After a few hours, of course, no overly informed judgment is possible, but my first impression is that this lens really has an amazing sharpness, which is established as early as f / 2.8 and f / 5.6 no longer truly increases.
Under f / 2.8 arises - how to be expected - a slight softness one, although not negative (the 50mm f / 1.4 G is - compared with it - at f / 2.8 rather lousy). Since you such a wide-open aperture, this is ohnhin preferably used for portrait, street, low-light or special close-by no means unwelcome.
Although the lens quite bulky fails you can even stow a D7100 with lens even without remodeling the interior partitions in a Tamrac 602 Expo and continue still either two different lenses or a lens and a flash accommodate - perfect.
Compared to the 50mm f / 1.8 D but it is with the 85er absolutely not go quietly, especially with attached hood - that one should consider the use of street photography.
The focus ring is to take very good and has a pleasant, gentle resistance, which helps not "overwhelm" the focal point to - you can just focus in on point.
The autofocus of the D7100 makes this objective even in low light conditions, in most cases immediately to the point. The AF speed may not win first prize, perhaps, but can be described as "slow" for my taste in any way. However, I have not tried it in the Continuous mode.
As far as my first conclusion - the lens gets an A strong buy recommendation, at least in connection with a D7100, with which I've tested so far. The test on a D5000 will follow shortly.
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Addendum 1 - to autofocus:
After six days I've tried the AF lens in continuous AF mode and also with subject tracking. I can not complain about the speed - rather than the reliability of the Scene Recognition System in the camera. Conclusion: The AF can be described for my taste quite as "fast" and sits in 98% of cases at once to the point.