I used my Aptus 22 for several years. A couple comments.
Lightroom does fine with the Aptus files but the default color calibration in LR for Leaf files isn't great. Once you do a DNG Profile calibration from a Macbeth chart, the colors are so much better. I agree the color from the first post image is just off.
I agree with Steve; the Dalsa 22 sensor is great from 25-100 and 200 is certainly very usable and can create nice prints, 400 is quite subjective. A high key 400 shot is fine, a B&W conversion of 400 and higher is actually interesting with a film chunkiness, usable when wanted.
My complaints were always, that 25-50 ISO required pumping too much power with studio packs. I found myself doing multi pops for many shoots, even with multiple 2400W packs.
Skin tones are truly the best part about the sensor in the A22 and A-II5 (same sensor).
Moire is a strong reality and honestly appeared in just about any shoot that had textiles or fine patterns. The only reshoot I have ever had to do was with the A22 shooting 10ft high art textile panels created for a synagogue. I've done plenty images side by side with the Canon 5DII and an A22 and the files are close but moire rears it ugly head with the Leaf often. Leaf Capture has one of the best local correction tools for moire especially since it saves it to the raw file allowing conversion in any other raw processor.
Leaf Capture make nice conversions, tethering is rock solid, but as an app, not the most pleasurable to use. I ran more files through LR since I prefer color toning and color work that adds to an image. I loathe the curve tool in Leaf Capture. Never understood why they couldn't make normal curves and levels tools.
Do I regret owning the Leaf, not at all. I created some very memorable work. What it did teach me was what I really want a digital back to be, better speed, image file quality, better ISO's for normal work and at a much better price point. Getting the A-II5 at $7-8K is reasonable. A22's are down in value to about $4K and the image quality is the same. Problem with digital backs is that they cost a lot and drop like bricks in value.
Battery life on the A22 wasn't great. I found it reasonable to get 2 hours of continuous operation in normal temps per SBL-160, pretty poor. So stock up on batteries and just suck it up and buy Leaf's branded batts, the generics don't work long, crap out for good. Buy a dual charger and keep those things charged for untethered studio work. For tethered studio work, not a big deal, run the back via firewire.
John