I'm on T-Mobile running there latest firmware. I successfully upgraded from sense by doing the system.img and boot.img method. I've had zero issues with WiFi or data. I followed his steps down to a T and all is good. Every phone might not be like mines with all the different variants. So flashing and finding out is the only way to find out.
Likewise here. T-mobile, had dev-unlocked, came from stock 4.20.531.5, followed instructions and loading up device now with apps.