Okay, here is the update. Just got the camera and lens yesterday. Well, as expected, the camera was pretty beaten up, brassing and scratches everywhere. But good thing is, only the rewind knob (the top part) was missing. The rewind shaft was still there. And there was a roll of unfinished film inside the film chamber. So I could easily just pull the rewind shaft up w/ my finger tips and open the film door
Already got spare parts ready, so that one was fixed in less than a minute.
The film chamber and shutter clothe were very clean, probably due to the unfinished film inside. But the light seals were all dry out, definitely need to be replaced. The batter door was jammed, I couldn't open it at all no matter how. So I took off the whole bottom plate (surprisingly easy, not like a couple of other old film cameras I had before). The batteries were licking green liquid but not dry yet, the battery chamber and contact were clean and dry, probably due to the batteries were still in early stage of corrosion. Threw away the batteries, soaked the whole thing in white vinegar. One hour later, I tried to unscrew the battery cover again, worked like a charm
The flash hotshoe was loose, I could see all the four hidden screws were loose. Took me a while to figure out how to reach them and tied them up. Now that's fixed too.
Put in new batteries, meter led turned on, don't know if the meter is accurate, yet, but I'll worry about that later. Took me an hour to clean the camera and put in new light seals and mirror bump foam, the camera seems working fine now.
Now it's the more exciting part, the lens. Well, it's not perfect, got some brassing on the aperture ring, but the glass is clean w/o any scratch or fungus. There is a little bit oily looking stuff right behind the very first element from the front, on the edge, only can be seen at certain angle. If look through the lens from front or back, can't see at all. Don't think it's gonna affect picture much, but I'll get it cleaned when I got time and tool to open up the front. The focusing ring is still buttery smooth, the aperture ring works great too. Overall it's in good working condition I guess.
Anyway, here is the camera and lens after cleanup:
I'm gonna go through a roll of film over the weekend and see how they turn out. For now, I can start to have some fun w/ the K50/1.2
Here is a wide open shot taken this morning with a K-7:
It's sharp enough even looking at 100% size, and I'm sure this can be improved if focused more accurately:
Cheers to all!