Um, no. There really aren't 10x engineers unless you're comparing someone with 2+ yrs experience to someone with 0 yrs. And by years experience, I mean years spent actually making things to completion. What you'll eventually find out is that there's 2x employees and 0.25x employees but very little above that. More than anything, it'll be the team dynamics and the company fit that determines who is or isn't in the upper/lower brackets.