Also, the idea was to have a common mount across several manufactures to increase lens commonality over a larger user base. Sigma is also on the L mount bandwagon. If you make a single lens that works across several brands then there are some cost savings that makes your equipment more appealing to buyers.Anyone know why Leica L mount was chosen for the new system rather than M mount? I really don't know much at all about Leica gear, but I'm assuming L mount must be the one offering the best IQ? I ask because the L mount lenses seem to be big and heavy, but I understand the M mount lenses are relatively small and light but still have good IQ, so I'm wondering why they chose the mount which seems to be associated with bigger and heavier lenses.