I have been tempted towards a faster lens for a while, particularly for indoor video and candid work. Having had good results with my old manual kit for macro, I ordered a m42 adapter for my Sony a57, and eventually ventured forth to see what I could get. There were some offers online in South Africa, but the real treasure chest was Tony Taverner at Camera Repair in "zonnebloem" - better known as the old District 6, overlooking Cape Town.
Having tried a few different Takumar's, Tony produced a Yashinon.
They have received rave reviews elsewhere, and now I see why. Wide open, this lens is pin sharp to every corner. I might be tempted to shoot raw even - I think this lens delivers sufficient detail to make it worth while, should I want to produce some nice 16"x20" prints. It is certainly a lens that make you think more about the process, and will take a little getting used to. I may order an adapter with a chip in, to tell the a57 how to stablise it, but so far, the engagement is good!
This is Tony, taken with the aforementioned lens.