Will try and find things...
Ronaldo:
Kane:
Sterling:
These are a couple of seasons old and Sterling's is from early in the season, but it fits in with us trying to create good chances rather than shoot from anywhere. Ronaldo will shoot from anywhere bacause a) he's not bad at it and B) he's mostly bothered about himself, but even with those good at shooting, most long shots don't go in.
It doesn't give everything, but does in part back up what I'm saying.
Not sure it does :)
It suggests that Ronaldo shoots from outside the box more than Sterling's small sample, but nowhere near enough to overturn Sterling's advantage, and all of them still shoot mostly inside the box. (I see it about 2/3 inside for Ronaldo, 3 out of 4 for Kane)
You're right, Sterling's is too small a sample - just 16 shots. It would only take two or three long shot to make those similar to Kane and Ronaldo.
Even if shooting randomly from outside the box with little chance of scoring was a good thing (it clearly isn't and City players are obviously encouraged not to do it), then discounting those shots still doesn't make Ronaldo or Kane's goals/shot ratio better than Sterling.
So, not only does he make more of his chances, there is less evidence he gives up possession with random low xG potshots as often.