So in terms of product quality, CMOS, the photosensitive device of the camera, can be regarded as homogeneous at the same price.

The difference between them mainly lies in the design of the lens.

The black card is designed as a mirrorless cameras with non-replaceable lens, and the entry level is generally matched with a standard zoom lens, such as 16-55.

The flagship level, such as RX1, is matched with a 35MM fixed-focus Zeiss lens.

Because there is no need to change the lens, the camera can be made very compact and light, and the imaging quality can be guaranteed.

Micro-single lens-replaceable mirrorless cameras is different from black card. Because of the need to design the lens mount and take into account the lenses of all focal segments, the camera body size will be larger.

Micro-single can be matched with various E-port and A-port lenses, and the quality of the lens often determines the quality of the photo, so it is difficult to directly compare the black card with the micro-single. If it is micro-single +sony's own bull's head, the same image quality will definitely be more expensive than the black card.

To sum up simply, if you need to shoot a fixed subject (culture, scenery), then a black card is the best choice, because it is very light and has a good picture quality. If you want to shoot a wide range of subjects, then the micro-single will be better, because you can change different lenses.