I have about 6-8 of each. I probably use the Dianas more, because they give me more of the effect I'm after when shooting them (vignetting, softness). All of my Dianas are the older ones, so I can't speak to the results with new ones. Both Dianas and Holgas will leak light. I use black tape on the bodies (and parts of the interiors) to minimize them. They're a lot of fun to use.