At the NECCC conference this past weekend, I was able to test a few 85 mm lenses. This is a great focal length for portraits and for creating lots of creamy bokeh. They also tend to be pretty sharp since they are prime lenses. I tested the Olympus 45 mm f1.8, Rokinon 85 mm f1.4, the Canon f1.2, and the Panasonic Leica Nocticron 42.5 mm f1.2. Sony also has an 85 mm f1.4 G Master wich is supposed to be very good but I didn't test that lens since I don't have a Sony camera.
First of all, I would like to shot two images to show why you might want a lens with such a wide aperture. It's certainly much easier to shoot with an f2.8 or f4 lens but you just don't get the same amount of bokeh. Here is a shot taken with the Rokinon f1.4 and one taken with the Canon 24-105 mm f4.