Ok. If you are buying this lens, you probably know that it's a cost-effective alternative to Leica glass. With that in mind, I have been shooting this lens a lot on my Sony A7ii using a basic Fotasy adaptor(which isn't too bad at all, and gets the job done for cheap.) The lens itself has a very cool appearance physically, which I like a lot! The shots also have a very unique look that I would say isn't really duplicated with other glass. I would consider this lens best for portraits.
Sharpness: I'll admit, it is a tad soft wide open, but this sacrifice comes at the benefit of giving a beautiful subject separation. The focused subjects in the photos somehow have a 'pop' to them. from F1.4 to F2 It's not clinical sharp like Leica glass, or Canon L, or Sigma Art, but I'm ok with that. AT like F2.8 and above, it can get really sharp. I have some shots that have surprised me at the sharpness as aperture is stepped down.
Color: Beautiful color, People have great skin tones, and I feel it shines best when used in warm natural light.
Bokeh/Depth: Bokeh is a little busy at times, but I think this helps draw your eye to the subject. Also Bokeh in the corners wide open has a slight swirl to it, and gives an almost vintage lens look. Some people like this because it's not a very common feature in lenses nowadays. It's hard to explain, but people in the photos just stand out with a certain depth within the rest of the photo. This isn't my idea of your standard wide open subject sharpness/background blur, which is something I'm familiar with since I shoot a lot of wide aperture prime lenses, but it just has a very cool feel to the shots, and the photos give people a more lifelike appearance. This is where it impresses me the most.
Vignette: It has slight darkness in the corners at wide-open apertures, but again, some people add vignetting during post-process anyway nowadays. It isn't necessarily a fault in my opinion.
Fault: The main thing that I don't like about this lens is the focus distance, It's almost one meter, and this prevents some of those up close and personal detail shots. I do plan to buy either a close-focus adaptor which is an easy fix for this, or I will buy the new techart AF adaptor.
Overall for the price, this lens is an amazing option for anyone's collection, from hobbyists, to full-fledged photographers. I think the photo/portrait 'look' that this lens puts out is a rare treat when it comes to lenses.