I've noticed better reception than my 11 Pro Max so far. I've only had it since Saturday though, so I haven't been in a lot of places.
It's definitely better than my 11 Pro Max at my desk at work. With the 11PM I could never get more than 1-2mbps, and dodgy at that. With the 15pm I get about 10-15mbps, still relatively slow, but at least usable!