Guess at the end of the day it all depends on user needs. I don't take pictures in clubs but if I ever need to do so then my 50mm 1.4 would be a weapon of choice.
An extra grand for a99 wouldn't be advisable for a semi pro or enthusiast especially if they don't have G lenses to maximise quality. An a77 with good glass fitted is just as good if not better than an a99 with cheap glass.
Just my opinion. Not scientific test conducted.
Ps. Noise reduction software is getting better all the time. Most client that I have seen will not magnify image 1:1 to check noise levels but obviously I am not an advocate for shoddy work.
I did the test when I got my hands on the A99... The A99 with the A380 kit lens (a very cheap Sony lens, 18-55mm) still had less noise in poor light than my A77 with a Zeiss lens (1.8 85mm IIRC; lens was also borrowed)... I was trying to prove to myself that the A77 was as good as the A99, but I had to find other ways to justify that the A77 is still the camera for me (and there ARE things, like, for example, I would have to change my lenses, as 2 of them are for crop cameras; also, I would have to change my flash units, which are for the old mount - and I have 3 of them; and finally, the A99 cannot trigger external flashes without using an additional flash, as it has no pop-up flash, so I would probably need an additional flash). But as for quality, there is just no comparison in poor lighting conditions.
In halfway decent lighting, though, the A77 is more than capable of holding its own against anything out there... Is it worth it to spend the extra money? My answer is "it depends"; it depends on your style of shooting and how much noise you find acceptable, and how much work you are willing to put into post (because you DO make a good point about noise reduction software)... And yes, the 1.4/f will help, but in a concert, unless you are in the first row, 50mm is probably going to be too short of a lens.
To me, the extra grand (more if you consider I must change 2 of my lenses as well) was not worth it either, so I stuck with the A77. But it is a matter of personal taste and preferences. But the quality was not the only issue but also the glass and the flashes for me... If it were only a quality issue, I would have probably gone with the A99!
I'm surprised Sony as a company is still in business. Don't hate me look at the company's performance past few years (on everything not just DSLR's)
They recently sold or downsized different departments to focus on imaging.
Yeah, Vaio was sold off to reduce cost, and TV business is being restructured. I think the company will turn around, but in general, NONE of the electronic companies are doing so hot right now...