It depends on what you mean by the term flaw. If you are asking about defects or operational /image issues, I have not heard of any. I haven't heard of any common failutres, for example, or image defects. Of course, it is possible to find image defects, I'm sure by doing things like grossly underexposing and then pulling up by 4 stops. Some will do things like that, and then claim they found a defect.
If you are asking about missing features, lacking a feature that a higher priced camera has, might not be considered a flaw. The list of such features would be pretty long, and different photographers might think their favorite feature that a more expensive model has, is missing. Autofocus Micro-adjustment, is high on my list of missing features.