Lunacy is awesome and as close as anyone has ever gotten to a fully functional Sketch for Windows. the fact that it can open Sketch files is a huge win for mixed teams everywhere, I love the thing.
I'd say Figma is closer to being "Sketch for Windows" as Lunacy, especially with the upcoming plugins and stuff. Or does Lunacy have something that Sketch has and Figma is lacking? (Honestly curious, I've only tested Lunacy v3, so no clue)
opening a sketch file in lunacy is easier and gives better accuracy than opening a sketch file in figma, because lunacy is designed to be a sketch clone (not just another piece of design software).
also, lunacy can save out .sketch files. again, figma is a FAR better tool for starting design on windows... but lunacy is a godsend if you're a windows user with a mac-based/sketch-based design team. simply put, it opens/saves/edits sketch files directly. this lets me work on my sketch files at home on my pc desktop, or allows any front-end dev or motion designer with a windows machine to open the sketch file and toy around.
if you are a single windows user, and you're starting a new design, 100% use figma (or, if you're me, affinity designer)
How does it stack up against Sketch? Curious to have some other designers' advice!