I don't own Mamiya 7 but I wouldn't base anything on Ken Rockwell's reviews. His reviews are very questionable at best. Many of his claims are really off the wall. Some of his product reviews were written before the products were released. (recent 50mm f/1.8G for example) Quite honestly, I don't know what to believe when he says something - even if he really had it in his hands and tested them or just going over spec sheets. I won't go into details here as he mostly reviews digital stuff.