[QUOTE=wharris;1536356]Now i feel dumb lol.. why do they call it 120 film then lol.. and I went for the trade.. I still have my mamiya 645 AF so im good =) heres a few photos that pushed me over the edge on the trade.. nothing special but sharp as hell when it comes to the 50 being wide open =)/QUOTE]
About the 120 roll film, see: http://en.wikipedia.org/wiki/Film_format and http://en.wikipedia.org/wiki/120_film
The "120" designation appears to be a kind of serial number, not a size in itself.
And congratulations on your Leica + lens: you'll enjoy it!