Does the aperture control on the lens not do anything at all? In other words, is it stuck wide open?
It's stuck wide open.
How's the quality when pixel peeping?
Not that great when viewed at 100%. In fact, I'd say that it's actually quite poor.
The biggest issue is guaranteeing focus. That's pretty hard when viewing through a 0.84x viewfinder with no split screen. When you think you've got the focus, you find that you've actually missed it by a few milimeters. At this level of DoF, that could potentially break the shot.
In this photo, you see that the focus is somewhere at "people". Everything after and before that is starting to go out of focus. Even so, "people" doesn't appear tack sharp and this is at ISO 400. I guess the reason for this softness is because the lens is being shot wide open and looking at the MTF charts for the Sony 50mm f1.4, that's pretty soft wide open. If a recent prime lens is soft wide open, what else can we expect from a 30 or 40 year old prime?
Shutter should be working normally if you got this far.
The shutter doesn't work. The lens focuses the image on the sensor, the mirror locks up when I take a photo but there is no shutter. I can't see how the shutter would be triggered as there isn't any electrical connection between the lens and the camera.
I'll take some photos of the lens tomorrow when I'm more awake