This is of interest to me too, the practical differences between P21 & P21+. This DB would be best suited to the work I do, unless Mamiya comes out with an upgrade on the ZD soon. What do you find is the maximum ISO you can use? Also, any experience with long exposures?
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Once again, high iso on all the digital cameras, except the Nikon D3 is very dependent on style of lighting, (high key, low key), color temp. of the light, and subjects.
Someone posted a still life at 800 iso on the p21+ and it looks ok, until you look at the fine detail edges and you see break up. Shooting something like a women's jacket with that type of transitional breakup will be very noticeable.
Regardless, even the Canon's have noise at anythng above 400 iso and I know someobody might post a sample but once again it is lighting/subject dependent.
One of the reasons most people think the dslrs work better under low light is the lenses are much faster and require less stop down for the same depth of field as a medium format camera and if you come in close, you have less bellows factor (falloff) on a 35mm lens than most medium format lenses.
I can shoot the p21 at 400 iso all day long with no issue, but it does require some very delicate post work, balancing luminousity and color noise reduction vs. sharpness.
You also have to shoot the phase backs at large IQ at high iso or you see more break up and I can't stress this enough you have to work these cameras in a lot of ways to find the best quality for the circumstance.
With the P30+ with a lot of light at 100 or 200 iso I get a much better look slightly underexposed than dead on or over exposed. With the same camera at 800 iso, shooting slightly underexposed can be a real problem as the automatic noise reduction kicks in and kills too much detail, hence you have to manually adjust.
The only way to really tell if any of these backs will work for you is to test them in the EXACT conditions you want to shoot in and mess with the exposure. Sometimes 400 iso one stop under will process cleaner than 800 iso.
Anything other than working these cameras in a real project under your absolute worst conditions is just a random guess.
I can tell you the P21+ is fast enough for me, but maybe not for you. I am postiive that the P30+ is the very best all around back for the work I do, (which is varied), but that's just for the way I work.
I doubt if it will translate for everyone the same.
The interesting thing for me is I got the p21+ mostly as a backup for the P30+, but now I use the smaller back more often.
JR