I'm carting around a new-to-me Pentax K200D, picked up cheaply, with SMC Pentax 50/1.4 (75mm EFOV) and SMC Pentax-M 28/2.8 (42mm EFOV). So it's all manual focus and stop-down metering. I do like the way Pentax has implemented the latter: in manual mode, press the "green button" and the diaphram closes, metering is done and the shutter speed is set to the metered value. With the camera at eye-level, this turns into a two finger, two button operation: meter then shutter release. In preliminary practice I've found it easy enough to achieve good manual focus - easier than with my Canon DSLRs (they're not being replaced; I'm just experimenting), so I'm guessing the Pentax focus screen is better set up for manual focus (though using lenses actually designed for manual focus no doubt helps). The finder does suffer a bit by comparison with my 5D and film SLRs - but it's not bad by comparison with other APS-C cameras.
Don't know whether I'll like this combination or not, but I like the field of view from those two lenses so it seems worth giving it a go. The 50mm seems highly thought of and I've liked it with film, so I want to see how it goes with digital. If I don't like things, I'll on-sell the camera without taking much of a loss and go back to using the lenses with film.
...Mike