He addresses this...
"Disadvantages of 3rd Gen Cameras (note: all will be overcome with time and iterations)
Sensor Size: You can’t quite get “Full Frame” sensors yet, like those available on the more expensive DSLRs. The current 3rd Gen Cameras, like the Nikon V1, will have a cropped sensor. What this means, in the case of the V1, is that the 10-30mm lens will actually be 27mm to 81mm. So, that’s not the end of the world, but something to consider. *Most* DSLR users are currently on cropped sensors, by the way. Only the high-end pros use full-frame sensor DSLRs.
Gordon Laing from
CameraLabs.com chimes in: Sensor size. Most mirror-less ILCs have smaller sensors than pro DSLRs. The exception is the super-expensive Leica M9 which does squeeze a 36x24mm full-frame sensor into a relatively small, mirrorless body, but the rest are smaller than full-frame.
Of these, the largest are the APS-C sensors deployed in Sony’s NEX and Samsung’s NX ranges. These are the same size as most DSLRs, including Nikon’s DX range. After this come Micro Four Thirds models from Panasonic and Olympus, followed by Nikon’s CX format in the J1 and V1, and below that the Pentax Q. As the sensor gets smaller, it typically becomes less sensitive to light and easier to saturate – so less dynamic range and more noise. It also typically means a bigger depth of field, which is no good if you like your out of focus bokeh effects. But on the upside, the smaller, the sensor, the smaller the lens.
Of all this, the important thing is to remember a Sony NEX or Samsung NX has the same sensor size as a Canon APS-C or Nikon DX body.
So, for the vast majority of DSLR users, this is not even a consideration, as they are used to these sensor sizes.
For the high-end pro DSLR users that want the equivalent full frame sensor, well they will only need to wait a little while. Maybe, like me, you already have good enough equipment to wait until those full-frame sensors are on the 3rd gen cameras."
I think the point is not where we are today but where we will be in 2-5 years.