I think no doubt he has had the best career of any batsman ever, longevity, quality of bolwers faced, consistentcy, but that doen't mean he was the best batsman, or the second best. Others have had higher peaks and taken over games and series and inpacted victories and dynasties more than he has. I still think from his own era, Lara was the better batsman, just didn't always apply himself or had himself in the right mindset or focus. But when he was on, he was probably better than anyone, same can be said for Sobers and Viv with Sobers also having consistency to add to that mix.
With regards to being a tier with Bradman and then the rest, I disagree, Tendulkar has had an amazing and un-paralled career, Sobers once he became a batsman first and for the next ten years averaged over 70 in tougher conditions and againts better bowlers, Viv and Lara faced significantly better bolwers and much longer careers and much more varied environs and had hit some amazing highs and were as capable match winners as anyone. Pollock, Headley and Chappell too deserves a place in that pantheon and it's hard to argue againts the peak of Ponting, the challenges and bowlers faced by Hutton, and the again incomparable career of Kallis, especially considering that he (and Sobers) were living a separate life as bowlers. That doesn't even include the original Master, the imcomparable Jack Hobbs who dominated in a bowers era and played on some awful pitches in a totally different time.
Bradman was the best, and with a little daylight, his consistentcy and determination were unmatched, but not in a different tier to those gentlemen and it would be to disrespect the different challenges that they had to overcome in a more modern, global and compeditive sport.