I'm curious about this as well, for all purposes the QCM6490 is made for Android and the benchmark I found seem to indicate that the TDP is half a Snapdragon 888 for ~30% less performance. The CPU looks pale in comparison to a Snapdragon 8 Gen 1 or Gen 2 but these are very high-end chips.

I'm not sure how reliable these benchmark are and they don't indicate anything about actual power consumption or efficiency. I wonder if there are good and in-depth reviews for mobile CPUs.