I don't think this is an accurate or fair analysis.
The lenses have to cover FF, so they are not going to be as small as lenses covering APS-C. That's the price of the IQ that is on offer from the sensor. That said, manually focusing Leica M/Zeiss ZM lenses are very small and can be used with an adaptor.
It is unfair to say the Sony/Zeiss lenses are bulky
and slow. They are not particularly bulky for their speed at all and the modest apertures selected (I am sure) to allow the lenses to remain reasonably compact. There will be fast glass coming and it will be bulky like any fast FF glass, because the issue is the size of the sensor, not the camera. There is no point putting a 36 mp sensor in a camera and compromising performance with overly small lenses full of optical compromises.
While you are right in that with, say the Zeiss 24-70, the body is 'vaguely approaching' the bulk of a Canon 6D with a 24-70 f4L, here are the actual figures for weight:
6D + 24-70 f4L - 1400g
A7R + 24-70 - 900g
The 6D (or equivalent D600 package is over 50% heavier with an additional half kilo, or more than a pound, in your hand. Now if we were to compare the bulk of a 6D/D600 with native prime against an A7 with Leica M lens and we are talking
half the volume. Oh, and the A7R has 36 MP against 20-24 for the 6D/D600. In reality, both for bulk and weight, the A7/R are much closer to XPro-1 territory than DSLRs.
Menus and interface is an issue that is personal and I doubt the menu system will be worse than the X100!
To me this camera is more like a geek toy than a camera.
To manny features and buttons. While the essential stuff is hard to get a firm control over.
The lenses are bulky and slow....
Once a lens in mounted its a big and cumbersome as a smaller SLR...