Recently I've been considering selling my RB67 and getting a Bronica SQ. My first experience with medium format was a yashicamat 124, and I enjoyed shooting in 6x6 quite a bit. One thing I couldn't stand about both the rb67 and the yashica was the waistlevel finder. The bulkiness of the rb made that problem worse. I'm actually fine with the weight of the RB, but the size is just obnoxious. (trying to shoot out of the passenger seat window of a small car with a waistlevel finder is not a good idea.) I've been looking into getting a metered prism for my RB, but they're all rather expensive, and are angled up slightly (whereas the bronica's prisms are eye-level). The RB prism could do spot and average metering, iirc. Will a bronica sq prism do spot metering? How does the size of the two compare? Will there be any differences in lenses (in terms of quality)?