I agree that there are different grades (?) of Sheffield steel. I was looking at some a few months back and IIRC Henry Taylor still offers high carbon steel for those who want them. They also make higher grades. I think real Sheffield companies would not put their name on El Junko.
Real Sheffield would be made in the UK but some seller may try to pass off PRC as Sheffield.
Some UK brands would be Sorby, Hamlet, Crown, Henry Taylor, Asley Iles. Packard brand is made by Hamlet; Woodworkers Supply brand is made by Crown.
I have Sorby, Crown, Hamlet, Hurricane, and Thompson.
I only have one Thompson because I already had others but wanted a detail spindle gouge.
I find my Hurricanes to be about the same as my Sorby, Crown, and Hamlet as to edge holding. I do not know where they are made but they are sized by UK specifications.
Another brand I hear high marks for are D-Way, equal to or better than Thompson.
UK made bowl gouges (does NOT apply to UK spindle gouges) are approximately 1/8" large in diameter than US spec.
The following pic shows how UK are measured....not really across the flute. I think they are still trying to mess with us for winning the war.
Here is one video comparing tool steels.