While the high price of an A7 probably slowed new customers rushing to Sony over Olympus I think the primary reason customers stuck with Olympus was "vendor lock-in" with lens mounts. People likely bought multiple m43 mount lenses to go with their Olympus or Panasonic. A customer would be more likely to buy another one of these brands if they had an existing lens collection over switching to the A7.
Note: I am reluctant to use the term vendor lock-in as the idea behind m43 was to have multiple camera manufacturers adopt a common lens mount. The fact that Sony and Canon have their own mounts is a net negative in my opinion.
Note: I am reluctant to use the term vendor lock-in as the idea behind m43 was to have multiple camera manufacturers adopt a common lens mount. The fact that Sony and Canon have their own mounts is a net negative in my opinion.