Spread into 3 groups of most agree-ness/discussed:
DK = Link
DK > Mewtwo
DK > Yoshi
Luigi > Link
Kirby > Bowser
Kirby > Mewtwo
Kirby > Roy
Link > Kirby
Link = Pikachu
Mewtwo = Yoshi
Peach >> Yoshi
Pikachu = Yoshi
Samus >> Yoshi
Yoshi > Pichu
DK > Ness
Kirby > Ness
Mewtwo > Zelda (please don't hurt me)
Mr.G&W >> Kirby
Pichu > Kirby
Pikachu > Kirby
Pikachu = Young Link
Young Link > Kirby
Young Link > Roy
Zelda >> Kirby
Zelda > Mr.G&W
Some of my thoughts: the whole Falco/Kirby thing I think is a little overrated, or maybe I'm wrong. A top Falco vs a top Kirby doesn't happen, and with Falco, they would often underestimate and/or not know the match-up. With Falco against Kirby, you want to camp and spam lasers to force an approach and then attack Kirby. Kirby is neat with Falco's lasers, but Swallowing Falco would be hard if the Falco is playing properly. Granted, Falco does a lot of Dair/Shine combos, so it is possible through some sort of mindgame. Mew2King posted a little while back that Silent Wolf's Kirby beat his Falco in friendlies, so maybe I'm wrong though. My uneducated opinion is Falco >> Kirby at best for Kirby.
Link vs Bowser is based on Skler's opinion, that Bowser is run down by spam, can't combo and Link has a way easier time on Bowser. Can anyone else confirm? I'd imagine it is Link >>> Bowser, but that hasn't been touched much.
Falcon is Pichu's easiest match-up of the top/high tiers, but it is still pretty brutal. Maybe Falcon >> Pichu, but I have no idea how it works fully.
I agree with Peach >> Yoshi and Samus >> Yoshi. Yoshi is much easier to combo and those character's CC is brutal, but Yoshi isn't helpless has some power to his attacks. Eggs are fun too. Still pretty horrible for Yoshi.
Also the general idea of "lol low tires r t3h dum" isn't too surprising. A lot of characters from early on get left behind and their metagames don't evolve nearly as fast. Occasionally though a few people will pick up a character and bring them to a level that would be standard if there were equal distribution of players using all the characters. Taj's Mewtwo, HDL's Link and Axe's Pikachu are all amazing, but part of that is because nobody has ever seen those characters at that level before, and often their opponents aren't super fluent with the match-up. There's a bunch of friendly videos of HDL taking games of SS and Zhu, Taj has accomplished a ton with Mewtwo, and Axe got 17th at Pound 4.
If all the characters were developed equally though, those players' characters would still be great, but they'd be typical and wouldn't be absolutely amazing, such as Lucky's Fox compared to other Foxes for example. In terms of the chart, low tiers still obviously have disadvantages; that's why they're low tiers, but there aren't as many match-ups as people think where characters get completely demolished.