I think it is misleading to compare Excel and Coda. There is some overlap, where it comes to list handling in Excel. Excel is just a completely different tool as far as flexibility goes. I would never even attempt to do a balance sheet and income statement in Coda, or some financial planning.
When it comes to list handling, yes. Coda has a lot more flexibility. But that aspect of Coda is better compared to Access, than to Excel.