Llorente is a bit too static no? His hold up play is on par with Kane but he lacks everything else Kane has. Kane is a lethal finisher, on either footed, he can pick a pass, run with the ball using his strength to keep players off. He is by no means express pace but he is certainly not Llorente slow. The only thing Llorente has over Kane is a little more aerial threat in the box.
It all depends on exactly how fit/unfit Kane is I guess, the game is a month away. He certainly didnt look overly injured running out onto the pitch to celebrate. There were rumours Kane would be fit for last game of the season, he has another whole month to rest up. He will be however lacking match sharpness after his extended time out.
I wouldn't even say his hold-up play is on the same level. He's good and I like him a lot but a fair few of his knock-downs and first touches end up with the opposition -- certainly more often than with Kane. But the real gulf in quality is what happens next: as you allude to, Kane just has passes and shots in his locker that Llorente doesn't, and a fair bit more creativity too. Despite the injury-marred season, if any quality of Kane has been accentuated this time around, it's his surprising creativity. He truly is the real deal at #10 as he's always claimed.
I expect Kane to be fully fit in 3 weeks time. Probably fitter than he usually is when he returns from injury. The lack of match sharpness won't be enough to override his sheer quality IMO. Contrary to some fans, I don't think Kane is
bad even when rushed back from injury (he always scores on his returns) and with the proper amount of time, he should fit straight into the first team again. Kane's not just any old player after all.
He's also earned the right to play after bringing Spurs through the group stage with his vital goals/assists and winning a knockout match on his own (albeit not an important one).