I think what you wrote is very well put. I think that its imperative that any and all issues with these new cameras be it Canon, Sony or pick your camera should be brought to the table and discussed and verified. Because of your posts, you've brought it to the attention of a lot of potential users and reviewers. When the production cameras hit the market, you can damn well bet they will be testing overheating issues.
People can piss and moan all they want that you are being unfair but you are not. I certainly would like to know before I plunk down a lot of money if the camera I am investing in is capable of working in all stated modes without compromise. If there are compromises, I can make an informed decision myself based on my personal needs. All I want is an unfettered review without bias.
Thanks for bringing this issue to the forefront.
But they are. A FF f2.8 lens will capture the same amount of light over the image as a m43 f1.4 lens (both wide-open). That also means you get the same shot noise (which is most of the noise in the image). You need to increase the ISO on the FF camera by 2 stops to get the same exposure. However that doesn't affect the noise as (i) most of the noise is in the light and changing the ISO won't change that and (ii) the sensor read noise will usually fall a bit with increasing ISO, so the total noise will be lower if anything. (Think of it this way... at the same illumination level if a f1.4 lens puts 1M photons onto a m43 sensor then a f2.8 lens will put 1M photons onto a FF sensor. Of those photons on average 1,000 will be the shot noise, in both cases.)
Increasing the ISO isn't a problem as the FF sensor will be able to capture around 4x the electrons of the m43 sensor due to its greater size. Increasing ISO by two stops knocks about a factor of 4 off that so it will be about the same as the m43 sensor and not saturate if the m43 sensor doesn't.
Also remember a 50mm f2.8 lens has the same diameter entrance pupil as a 25mm f1.4 lens (17.86mm) so the DoF will be the same at the widest aperture. The FoV will also be the same. Diffraction softening will also occur at the same DoF (it goes with DoF, regardless of format). Hence the minimum and maximum amounts of available DoF are the same.
