An awful lot of people seem to be coming at this backwards.
Do you feel yourself limited by the speed of the lenses you already have? In other words, do you find yourself forced to use higher ISOs/EIs than you like, or longer shutter speeds than you can reliably hand-hold?
Or do you like REALLY shallow depth of field? This is where the boring shots come in, in my opinion. Yes, it can be an essential part of your photographic style. Or it can be 'me-too' garbage, as is all too often the case.
If you really feel yourself limited by the fastest lens you own, then something still faster is an excellent idea. But if you just generally think it's cool to have a super-fast lens, you're probably a twit.
I've used a 50/1.2 Nikkor on my SLRs, and 35/1.2 Voigtländer, 50/1.2 Canon and 50/1 Noctilux on my Leicas. I used the Nikkor so little that I sold it; despite the adulation heaped upon the Canon, I don't think it's a very good lens at wider than f/2; the Voigtländer is very nice indeed but I'll live with 1/2 stop slower on my Summilux; and for raw speed, the Noctilux has it all.
So have I bought the Noctilux? No, because I've just bought a Thambar -- an even more specialized lens! Merely because a lens is specialized is no reason to denigrate those who buy it, IF they have a use for it (obviously I'd not buy the Thambar otherwise).
But it was touch and go between the two. And if I can sell my 12x15 inch Gandolfi FAST, I might buy the Noctilux as well.
Cheers,
R.