I have a copy of VisiCalc on a 5¼" floppy that I can boot on a IBM 5155 'luggable'.

It is surprisingly 1-2-3 like. You can see that Lotus directly ripped off Dan conceptually. I don't have enough background to know if Lotus 1-2-3 implemented significant improvements over VisiCalc; I do think that Dan Bricklin was a visionary to see that a 'what-if?' analysis on a blackboard would be an incredible exercise in what came to be called a spreadsheet.

[The luggable boots a version of DOS that doesn't support sub-directories, so it is pre-2.0.]