Cuthbert,
The 50/1.2 AI is supposed to be a major improvement over the 55.
Yes I heard it but the common knowledge is that a Canon FDn 50mm f1.2 even non L is better. For the FD 55mm f1.2, mine is loaded with coma and so soft that as said before it looks like a painting, here there are some samples:
It's weird but not always unpleasant, still I cannot define it a "good" f1.2
On the other side the performance of the Fujinon wide open is astonishing, just look at the first picture:
I have few shots of the Canon Fdn wide open, one of my favourite self portraits was taken wide open with this lens...it's a little soft wide open, also in the centre, but still good for portraits:
Cheap and functional, but crippled. The KX is pretty much what the K1000 should have been. Full readout of shutter and aperture in viewfinder, and DOF preview. You can turn the meter off. Can be found cheaply, but not readily. The K 1000 is generally badly overpriced, probably because of photography schools' recommendations.
The K1000 is simple as functional as a Leica which doesn't offer ANY of the features you say (aperture and shutter speed in finder, DOF preview, the EXTERNAL meter is often always one). plus all the K series are a little louder than a Leica, with the LX if you lock the mirror up the sound of the shutter is more or less the sound of a Leica.
I agree that prices of K1000 are getting ridiculous that's the reason why I recommend a KM but even better a Spotmatic F that is smooth...having said that a K1000 with K50mm f1.2 would do the job.