But the key difference is that it's leagues better than other browser engines on quality. From the perspective of competition this isn't great, but the network effects are hard to ignore. Firefox and Safari (webkit) just tend not to work as well.
It's very different in terms of quality though. Internet Explorer was a terrible browser and often lagging in implementing standards. The better comparison would be Safari now, which often completely breaks many sites on mobile for me. It also doesn't eliminate a lot of newer CSS animations properly.
This is really very unfortunate because it's good to have competition in browser implementations. Everything is Chrome under the hood now except for Safari and Firefox.