Back in 2001, Jim Lawson had penciled eight pages of the first issue of the new TMNT comic, and I had started inking them, when he decided that he wasn't happy with the way he had drawn them, and wanted to start all over again. So he did! Some of the pages I had almost finished inking, although I hadn't done anything on page one (unless you want to count inking the panel border).
In my opinion, there was nothing wrong with any of these pages. (If it had been me who'd drawn them, I would have been happy to keep them as is.) But Jim felt he could do better, and redrew them. Pretty amazing. -- PL