Owned all three at one time or another. Now have only the CZ83, allwere/are .32ACP/7.65. CZ50 and 70 are truly "medium" size, 83 is "large medium". BUT, my 83 has 15 round magazine. That plus one in chamber is a whole lot of WWSTHP. Triggers on 50/70 are atrocious, on the 83's very, very nice in DA and SA. 50/70 imprts now very cheap, 83 is more. More difficult to conceal, and one asks "why?" when alternatives in more potent calibers in equal-size or smaller guns abound. In same caliber (.32ACP, there is the surprisingly good KelTec P32, a low-recoil, locked breech, lightweight and very thin pocket pistol.All three CZ's are collectibles and CZ has always made good guns. The 83 is larger because original chambering was/is 9mm Makarov. According to Blue Book, it is available in 9mm MAK through the importer. Haven't seen one so chambered. For CCW, the operative question becomes: "Can you cache a small Czech?". Sorry, TFL, I just couldn't resist!