From the feedback on the C2:
It seems the C3 improves on: 5G, fingerprint sensor.
However, Jolla did not mention their plans for the CPU and the display technology. It seems the C2 was inferior to the 10iii at this respect, and for the C3 the comparison with the 10iii/10v is unclear.
Besides raw power, I am more interested in hardware support. Did Jolla do a good job with the C2? For example, the 10iii has an annoying focussing issue (it refuses to take pictures if the subject is moving). Does the C2 suffer from similar problems? I am asking to know what to expect about the C3.