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For example from March 2019:

https://www.phoronix.com/scan.php?page=article&item=spec-mel...

I think there are some further in-depth benchmarks with multiple generations of Intel and AMD, but can't find the link.

it depends on the kind of applications / loads you are performing, so really it's not possible to put a static value to that. best is just to test it with some benchmarks yourself to be sure how it impacts you. some people report losses of like 20%, others 1 or 2%...

The Haswell TSX was found to be unsound and disabled not long after it came out.

Haswell doesn't have this feature

I believe Haswell does have Hardware Lock Elision, but it was disabled by a microcode update.

It was disabled because it didn’t work. So I guess it’s in the eye of the beholder.