Qualcomm published a blog post that it's X20 LTE modem-equipped Snapdragon 845 SoC offers superior mobile connectivity than other modems such as the Intel XMM 7480 and Intel XMM 7360 found in various iPhones. The data has been gathered from Speedtest.net results on AT&T and T-Mobile.
https://www.notebookcheck.net/Qualcomm-claims-the-Snapdragon-845-offers-superior-cellular-performance-than-the-Intel-XMM-modems-found-in-iPhones.317750.0.html