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Hi all. I have owned 8" f8 planetary dob better than 1/10 wave pv. A 12" f5 flexitube skywatcher and currently a 14" f5.1 hubbleoptics powered home made dob,(cost of the latter about 2/3s cost of skywatcher). At one time on a night of good seeing all three were set up with two observers and the following was noted: Jupiter 8" and 12" were similar on detail resolved, 14" had a noticable edge on over the others. Moon again not much between 8 and 12, but 14" was in a different class it seemed fine detail resolution was cleaner on small surface luna detail. DSO 14" ruled clearly (made looking through the 8 like looking through dark glasses by comparison) and clearly the 14 showed brighter and better resolution (on for example Tuc 47). So yes a 14 is bigger than a 12 but you do get a bigger brighter picture. Optical quality probably plays a part as well. My 14" Hubbleoptics mirror is rated at better than 1/25 wave front PV.
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