You inserted the same sims in sim1 of both devices but m5 is showing 0? Looks like this is not working correct. Check once in safe mode. If not solved perform software repair using Xperia companion(all your internal data will be lost). If still not solved, visit the service center.
Coming to sim2, the difference is either due to the different network bands selected on same network mode or something like external case is interfering with the signal. If there is an external case, once remove and try.