There aren't any really good (REALLY good) brushless motors out there that are sensored
That has got nothing to do with sensorless or sensored, I think it would be easier to make an ultra high power esc/motor combo sensored. it's more a matter of costs.
Lack of high end sensored motors most likely stems from the lack of high end sensored speed controllers. Griffinru made a feigao work with a novak hv using the hv motor as a sensor and putting the leads to the feigao. Neither are high end, but I bet it had great low speed driveability! The novak esc is supposed to be quite good, just the motors are a little small for heavier applications.