There should be an RX1 variant with 24-105 F4/F2.8 lens. Add a battery grip like the Fuji XPRO and this would be almost perfect for most usage. The 35mm even if it's F2 isn't that interesting enough for its price of 3K.
A lens like that would be huge and defeats the whole purpose of the camera.
+1 however, the above comment regarding the 35mm f/2 lens is valid. A similarly sized camera with exchangeable lenses though ... 
But you also have to consider that it's not just a 35mm f/2. It's probably the best 35 mm f/2. The lens crazy sharp. Sharper than the famed Sigma 35 f/1.4.
Also the bokeh is butter smooth. Which is hard to achieve on a wide angle lense.
http://neilvn.com/tangents/bokeh-sony-rx1-vs-nikon-35mmm-f1-4g/
