<p>Dear Alex! First of all congratulations on getting The Mamiya RZ. Actually, this beast is still alive and shooting - many important photographers still use it and it has produced some of the world best images, so I am sure you won't be disappointed with it. <br>
If I may suggest, your post is a bit confusing in the sense that it's hard to grasp the exact question that you're asking.<br>
Try and post clear questions - the fewer the lines, the better - that way you will get more help !!<br>
Are your subjects in motion? Are you hand holding or shooting on a tripod?<br>
If you focus on a subject and then move the camera around, that subject might not be in focus anymore, depending on the distance from you and these subjects, what lens you are using and what aperture you are using. Assuming you are on a tripod and your subjects are not moving, to begin with, try and do this: do the composition as it were the exact final composition. Then put in focus the subject which is farther away. Then stop down the aperture (so f8, f11, f16, f22 etc.) while holding down the depth of field preview lever on the lens, which will make your ground glass go a bit darker, but will also show you which parts of your composition are in focus and which aren't. It might be hard to do this at night time, but I would start with this.<br>
Best,</p>