After much thought, I've decided to let the Pentax KP go. It's hard because it's one of those cameras I know I'm going to miss, but I find I don't readily convert back to DSLR shooting. I am spoiled by compact camera dimensions and weight, as well as (apparently) EVFs. I thought I'd be more ready to enjoy a DSLR viewfinder, but maybe it's that my eyes are aging or something, but I don't enjoy that reflex-mirror view like I used to. Analogue SLRs are different, what with their huge viewfinders, but APS-C reflex viewfinders? I think I'm not a fan.
I thought I would just keep shooting the KP when it mattered, and be happy with it sitting on the shelf the rest of the time, but it's one of those cameras that makes you feel a little guilty for not using it. Whether it's that money is tied up in it (when we are looking to increase savings for the eventual purchase of a home) or just the pure photographer-guilt of not wanting to shoot with something that I nonetheless really like.
Funny enough, while I thought I wanted to upgrade the file quality of my images, and went from a 20MP M4/3 sensor to a 24MP APS-C sensor with really good high-ISO capability, I trended back in the other direction, with my digital system camera being a comfortable 16MP M4/3 body like the ones I've used for years. I don't hold any illusions about the limitations of that series of sensors: noise intrudes fairly early on, cropping is rather limited, dynamic range isn't really great. But I think it's film shooting that has turned me back on to the M4/3 cameras.
Shooting 35mm film encourages me to engage the whole frame, since it's not really conducive to cropping more than trimming edges slightly. In that way, it makes composition more important than digital, plus, I feel I can see the quirks of the optics better, since you tend to see the true center of the optics when you look at the center of an uncropped film image, and the true edges when you look outwards form the center. If there's decreased edge sharpness, vignette, swirly bokeh, etc., you can see it in the image, and I like this. "Character" as it's called.
Shooting 16MP M4/3 has a similar thing going for it. Some of the lenses have character that's recognizable (like the 20/1.7, the 17/2.8 and possibly the 25/1.8 and 45/1.8). The EVF of the EM5 mkII makes it easy to compose for the whole frame, paying attention to elements on the edges. The dynamic range forces me to shoot more to preserve one end of the exposure range than the other, usually saving highlights and allowing shadows to go dark. Unlike a more advanced sensor like the APS-C KP's, you can't expect the shadows and highlights to both be hugely flexible at the same time. M4/3 feels "organic" to me in a way that some other systems don't, even though I will admit that it's probably just my long experience and comfort level with it.