I’ve come close enough to buying a GL690 to have chickened out at the payment stage twice. The size scares me off. I’m sure I’ll end up buying one eventually.
GL690 is 6x9 so a bit bigger.
there's much "huge" meme about the P6, but it's all relative, depends people's mileage, if you check details about who writes the n-th blog page or review about a P6, often they come from the digital world and have been exposed only to diminutive cameras.
I have used Praktisix but don't own one, did opt for the Kiev, because they are said to be easier to fix, and I also have a full disassembly commented video bought from a repairman from Dnepropetrovsk, the #1 on his list there (70$ but back then I bought cheaper) :
http://fotoremontnik.ru/service , you can see he has also one for the Pentacon Six (#15, and cheaper 40$, so maybe in fact less to unscrew ...). Comments in russian and i manage enough, but it's just mostly basic vocabulary and even without comment, you'll get it, since it's all very detailed, all is shown.
What I mean is that the feeling I could be self-dependent in case of maintenance is very important, so the simplier the better, hence my choice of Kiev instead of P6. Kiev-6 can take also 220 film and I do my own 220 rolls.
so, I don't have a P6 at hands to show size, but this gives an idea, the Kiev is almost same:
and here for comparison I hold a Yashica-FX3 ie. one of the smaller form factor japanese SLR and a Kiev-6, both with similar focal lens, the Yashica with a Sankor 28mm and the Kiev-6 a Flektogon 50mm. The Kiev has the unmetered prism, I do meter externally anyway.
so yes very different size but the K6 is quite ergonomic, I add a small grip convenient for hand holding it for walks.
The Yashica FX is so small it is pocketable, I use mostly MF cameras so when I grab a 35mm camera it feels really funny how small they are...
Then I show also what has become my main MF, in fact a technical/press bellows camera, with RF and very convenient it can take 6x9, 6x7 backs and also a 4x5 extender. Here with a long Tele-Arton 270mm on, but a wide-angle lens is much smaller with very little bellows extension. Not much bigger than the K6.