Has there really been any meaningful development in sensors since the adoption of BSI-CMOS technology? Stacked sensors bring speed, but no discernible IQ difference to the table. At least FF sensors have been pretty much stagnant since the 42mpix Sony sensor, aside from Canon at last catching up to Sony with the R5 sensor. Some megapixel race stuff has been happening, but no big IQ improvements.
Not really, ES. Just IMHO, of course.
My E-M1 MkI uses the Panasonic 16 MPx sensor. It gets a bit noisy between ISO 1600 to 6400, depending on the light, of course. The E-PM2 is a bit better, with slightly richer colours, uses the Sony 16 MPx sensor, and it was released in September 2012. My E-M1 MkII has the Sony 20 MPx sensor, and is slightly better than both, 1/3 to 1/2 a stop, at best.
Seems that other manufacturers are much the same, hitting their straps around 2012. Compare the DR of e.g. the lovely Nikon D3 D4 D5 D6 bodies at Bill Claff's photonstophotos site.
Of course, the big manufacturers have mostly gone mirrorless, with varying degrees of success, but the sensor technology seems to have reached near perfection about ten years ago.
Even readout speed has stalled for most. My E-M1 MkII does 60 fps, and it's 6 y.o. now.
I've been looking at the new crop of 100 MPx cameras over the last week (stress testing my new PC), and their IQ is quite stunning, as one would expect. However, big and not very versatile for most general type photography.
@boojum has just bought the Hasselblad 100c, and even the reduced size JPEGs he can upload to Flickr are fantastic. Gorgeous. However, I don't think it would suit me.
The ~40 MPx 135 format cameras and images don't really have anything I lust after. Better noise at high ISO, but that's about it.
The E-M1 MkII may well see me out ...