I'm not sure I understand the griping about Olympus menus. I find the Sony menus to be far harder to figure out and understand, and the documentation poorer as well. Olympus menus are deep, but are logically laid out (for the most part anyway), and allow a level of customization in the case of the E-M1 that simply blows away what can be done with the A7.
Sony's menus are a scattered mess, to me, just like their ergonomics. The A7 has only
just enough configurability to make it usable IMO, not ideal. The E-M1 goes well beyond that.
The good news, with either, is that once you've set the camera up to be tolerable for use and learn it, you only infrequently need to jump back into the menu system. You have to do it more with the Sony, unfortunately, because there are fewer customizations available and some things cannot be assigned to a sensible discrete control.
(Yes, Jono: You can set the AE/AF Lock button to spot meter and hold the setting until pressed again on the E-M1 just like you can with the A7. That's how mine is set up. I've yet to figure out the Sony A7's spot metering, tho: it seems to jump all over the place when I press the AELock button. ;-)
In essence, the A7 replaces the M9 for me mostly on the basis of what is for me a much better quality set of lenses (Leica R and Nikkor vs mostly Voigtländer, which is not to say that the Voigtländers are bad btw) and the EVF. Although there are moments when I wish the A7 had the E-M1 viewfinder's auto-adaptive brightness ... It gets tiresome to have to constantly jump into the menus to push the brightness up and down when going from sunny day to indoor shooting.
We are awash in the riches of excellent cameras to work with! With features we could barely dream of even half a decade ago!
Sony A7 + Summilux-R 50mm f/1.4
WiFi controlled capture
Processed from JPEG with iPhone 4S and Snapseed
Godfrey