Oh yeah, lots! Back in Ye Olde Days, it was commonly accepted that most webcomics would be trash when they started because they were made by some nerd who’d never drawn before and was learning as he went. 

But Narbonic is probably the most noteworthy, especially in terms of how fast it improved. A lot of the first few chapters are literally unreadable from terrible lettering, as seen in this strip in the first week

It’s a proper professional-looking strip by the end, which is all the more impressive given how short of a comic it is; it only ran five years! You can read it in a few hours, and you should if for no other reason that to appreciate how the last three or four chapters are the best and most satisfying ending of any webcomic ever.