I don't have a problem w/ Sony sensors but it's a concern whenever another manufacturer jumps onboard the Sony train. Variety is good artistically and from supply chain & competition standpoint. Also, probably just me, but I feel a Sony sensor has no business in a Leica camera from a heritage and price point perspective. The uniqueness that Leica provides over commodity mainstream brands needs to be apparent in the files else I seriously start to question the value prop. I.e., it can't be just about the build quality and shooting experience.