There is photopea.com that should cover needs of most people and affinity photo for more advanced photo production. Not free but single purchase somewhat reasonably priced at $40. Its very user friendly but not too limited at the same time. I like it.
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Krita is rather to be compared with Clip Studio, They stated it themselves in their blog in august:
https://krita.org/en/item/what-the-krita-developers-are-up-t...
I suppose it just depends on what you need in an image editor but in my opinion GIMP has been dead in the water for well over a decade at this point.
Krita on the other hand has a pretty rich feature set and seems to be more actively developed - I just wish it were more performant and a bit less quirky, interface-wise. I still use it on a regular basis though.