Before making the switch, I had seen many posts on Samsung radios performing worse than Motorola's. Fortunately, I've yet to have any discernible issues.
I seem to get 1 less signal bar (but I read that that's not the best measure of signal strength) than with my old Droid Bionic at home, but no dropped calls (which are very clear) and LTE speeds are faster. Signal strength readings of -93 dBm, 47 asu for the GS4, but not having my Droid Bionic anymore I can't do a comparison of this, but I do have the old Speed Test results.
GS4:
Droid Bionic:
And LTE
Test Date: Apr 2, 2013 1:20:09 pm
Connection Type: Lte
Server: Washington, DC
Download: 20216 kbps
Upload: 12778 kbps
Ping: 70 ms
I'll also say that the GPS now gets a fix on my position faster than with my Bionic, and with 18-satellites (when the Bionic would see half that at most). I'm very satisfied with the GS4 so far.
I seem to get 1 less signal bar (but I read that that's not the best measure of signal strength) than with my old Droid Bionic at home, but no dropped calls (which are very clear) and LTE speeds are faster. Signal strength readings of -93 dBm, 47 asu for the GS4, but not having my Droid Bionic anymore I can't do a comparison of this, but I do have the old Speed Test results.
GS4:

Droid Bionic:
And LTE
Test Date: Apr 2, 2013 1:20:09 pm
Connection Type: Lte
Server: Washington, DC
Download: 20216 kbps
Upload: 12778 kbps
Ping: 70 ms
I'll also say that the GPS now gets a fix on my position faster than with my Bionic, and with 18-satellites (when the Bionic would see half that at most). I'm very satisfied with the GS4 so far.