I love my FA 77 for any type of photography. It's the sharpest lens wide open I own. Its bokeh is the nicest of any lens I own. It really does have a special look to it. The tones it produces are just very natural. For some reason, the AF has become faster and more accurate since I got my K-30, so a former "weakness" isn't even a weakness any more.
The only negative I can say is it doesn't handle flare that well and you do have to deal with CA in certain situations.
I have gone back and forth between the FA 77 and the DA*55 as my favorite lens, but right now I have to say it's the FA77.
Why not rent it and see what the fuss is about? If you don't like it, you've not spent $800.