>>4177506It's a combination of factors
1: Most fujinon APS-C lenses are quite shit
2: X-trans has a mild softening effect similar to an AA filter because blur > moire for some people. Blur is only visible with huge enargements (ie: of cropped photos) and past 100% or at close distance/with good eyesight on high density prints, moire is a macroscopic problem. It depends on what and how you photograph.
3: 40mp APS-C is at the pixel density of an 90mp full frame camera. At this point, diffraction starts eating your resolution for breakfast past f5.6. Most photos worth looking at are taken past f5.6. Meanwhile, most modern lenses do not reach their peak resolution until f5.6-f8, so it's unlikely you'll ever get the most out of the sensor an the lens at the same time.
The only way to truly make a camera higher resolution at this point is to make the cameras and lenses larger. 62mp full frame, 26mp APS-C, and 16MP M4/3 are the practical limit for real world photography. Anything past that is just smoothing out the image very, very slightly.
Enter fujifilm. Again. With a crop medium format MILC that is the size of a full frame DSLR, and has the pixel density of a 62mp full frame camera. Within this camera is the ability to shoot as full frame, aps-c, and micro four thirds with astounding quality. Or use the whole 100mp and print an image that fills an entire wall at 300 DPI.