He 100% is mate, the fact Barkley is Scouse shouldn't cloud anyone's judgment on him as it seems to be doing with so many others.
Look at it completely dispassionately through stats.
And by stats I don't just mean goals/assists.
How often do they touch the ball? How often do they create chances? How good are the chances they create? How often do they beat a man which creates space further up the pitch? How far do they carry the ball forwards in a game?
Sigurdsson has a good goalscoring record, a good assist record, but his all round game is poor by PL standards.
When you break it down like that Barkley is far better. He is also 4.5 years younger.