Iíve had a pro lab printing 1,5*2 meters (6 ft * 8 ft) from a 120 (6*7) pinhole for an exhibition a few months ago - printed on aluminum. Sold the picture for about 820 $ (5000 Norwegian Krones) to a couple who to have it in their living room.
I guess the price they were happy to pay kind of indicates the quality.....