Depends on the game and the CRT. Not all CRTs were made equal, my old Eizo FlexScan had a near LCD like quality as long as you didn't go above 800×600 (above that, the filtering kicked in with some additional blur), so is my professional HP monitor with a Trinitron tube (RIP).

Some games also took advantage of color artifacts. Some didn't.

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Depends on the size of the screen tbh. Retro games look fantastic on my Miyoo Mini +.

I have a 19" CRT monitor and a larger CRT TV for retro purposes, but I'm not too fond of using filters on modern displays, most filters look 'fake' to me.

Would a simple blur filter be enough to emulate this?