Assuming best case, back when the game came out in August, when the original people were attempting coil, they were at best in full darklight gear (i70), and most likely a mix of lvl 55-60 dungeon greens, and darklight (lets say 65 average).
These people, attempting coil 1-4, were 28% short of ilvl (meaning, coil has 90 gear) 90/70 = 128%. So the difference for them entering T1 coil (70), and the max was that. Now, with the new coil, in order for it to have 'equal' progression difficulty, it will need to have lvl 115 gear drop (assuming the 28% jump from 90->115).
Discuss.