It's not resolution which is the limiting factor for small sensors; in fact many of them have higher per-sensor resolution than a DSLR. It's the fact that as y

It's not resolution which is the limiting factor for small sensors; in fact many of them have higher per-sensor resolution than a DSLR. It's the fact that as you push more and smaller detector-sites into a such a small array you experience more and more noise, which means the image quality degrades rapidly with falling light. There's a balance between size of detector-sites and array density and any technology that reduces small sensor noise can equally be applied to large sensors with larger detector-sites in order to maintain their advantage. The best analogy I encountered was to consider each detector-site as a 'light-gathering bucket'. A big bucket can catch more photons and hence has a higher SNR than a small bucket once you deduct cosmic rays and read-out errors etc. So a medium-format 21MP is better than an APS-C 21MP array which is better than a phone-sized 21MP array. It doesn't really matter how many small-arrays you point at one target because it's the SNR at the individual detector-sites that matters. ~~ TLDR: this camera can never compete directly with a DSLR on raw photo quality but will offer other interesting capabilities that DSLRs can't.