Originally posted by tranq78 I own the FA85 and the 77. From the perspective of just practical normal usage, I must respectfully disagree.
I have been using the FA85 for the last 15 years or so and can only emphasize your oberservations. The special character of the lens will be very obvious wide open and when stopped down it will become a decent, but not-out-this-world lens. It is then "just" sharp and contrasty. I cannot compare it to the 77 Ltd., but the 85 would be a very good choice for concert photography at short and medium distances.
If you stand back in the hall, the thread opener certainly needs a longer focal length (depending on the venues, of course). A standard 70-200/2.8 would be my preferred choice along with the 85/1.4 a 50/1.4 and something like a 24/2.0 for shots at closer distances.
Large concert events often have more than enough light on the stage. There you wouldn't need the extremely fast lenses, but at least if helpd with manual focusing.
Ben