For example --- #162 on the NA ladder was a member of TL with a (MMR OR ELO) of 2927 - at the same time Stixxay, who is #201 had a difference of only (350 MMR) - That is the same difference from Platinum V 0LP to Silver I 90 LP. Keep in mind, these players are only 39 spots away from each other. Both are amazing players with excellent mechanics, yet they're an entire division apart. That is what makes the Challenger Tier so damn insane. You have look at each person individually. The amount of time having to be put in to stay challenger is also insane or you'll be surpassed out of you allocated spot in no time at all. Where in Diamond you could just chill for a few days like any other Elo.
There are 200 players in Challenger, while there can be an infinite number of players in Master (currently 600+ on EUW). Once you reach Diamond 1 100lp, you have to win a bo5 to get into Master. You start there with 0LP, and earn points for each win, just like anywhere else. That is where i see the big difference in skill set. On different servers. To be in EUW and play in Master is just not nearly as impressive while being compared to 1 of the limited 200 who are truly Challenger.