Unless I missed something, I haven't seen one person or credible reviewer mention any issues with dropped calls or voice quality on either end.
I just downloaded and installed "Network Signal Info" from the Playstore on both my Axon 7 and Galaxy S7 Active. I turned off Wi-Fi on both phones. The S7 showed a percentage of 50% , LTE, and a strength of -101 dBm. The Axon 7 showed a percentage of 46% and a strength of -110 dBm. I then reconnected WiFi. Wifi strength on the S7 was -40 dBm and a speed of 144 Mbps. The Axon 7 showed a Wifi strength of -38 dBm and also a speed of 144 Mbps. Yes, there is a difference, but not enough to cause any issues I would think.I ran speedtest.net on both phones and the result was nearly identical. It might be an issue for some users depending on their carrier and cell tower location, but honestly I see no problem here.