The press says Sky voice is indistinguishable from Scarlett Johansson, but I hear zero similarities to her voice in any of her films. Besides, of course, that it is a standard-issue unaccented white anglo female.
Sounds only like Scarlett Johansson to me. I watch a lot of TV and film and can't think of a single person it sounds like other than Scarlett Johansson. I think the same would be true for most people not in the US. The tweets (one referencing Scarlett Johansson by name, and one from Sam just saying "her" are also confirming my bias here.)
In all honesty, I thought this was just another thing AI vacuumed up without thought. Weird how when it's a "real" celebrity's work that gets put through the AI sausage machine people get skittish.