I feel this whole ergonomics thing is over blown. I use digital cameras made by Canon, Fuji and Sony and film cameras by Canon, Fuji and Tachihara and am productive with all of them. Sure, they are all a bit different, but once you figure out a camera and set it up to how you shoot, they all deliver.
Humans are very adaptable if we let them. For instance, I used to travel a lot for work and rent cars. Every car rented felt weird compared to my own...but after using the car for a couple weeks, things began to feel good...to the point when I got home and climbed into my own car, it feels weird at first.
I find it totally hilarious when we get into menus...for Christ sake, how much time do we spend in these menus...and if we spend more than a miniscule time in a menu while shooting...that system is totally screwed as when you are in a menu...you are not shooting.
The only reason I go into my Sony menus is to format a card...in other words, the system is customized to the point I don't need the menus when shooting.