The party consists of the following
Elf Fey warlock with chain pact.
Elf Rogue arcane trickster
Half-Elf Paladin of the Ancients.
The player who plays the paladin has no issues with the system.
The player who plays the warlock has an issue with the proficiency bonus only goes from +2 to +6. Given 20 stat, he does not see a significant difference from 1st level having a +6 proficiency bonus, to a 20th level character having +11. He wants a bigger difference between apprentice and master as far as bonus rolled.
The one playing an arcane trickster feels that characters that the feel of the character gaining power is to slow. In pathfinder just about anything you take, even if it is marginal makes you more powerful, and he can see it. He does not at this point see it in 5e, yes you get more hp and such but.
Then you have me, I love the system. I love that creatures have more of a shelf life, love that they separated magic item from being needed by characters, it is now a straight power bonus. The only issue I have with it, is I want more support now. This is the system that I wanted for years now. I just wish now that the system I want is out, that it had/has the same level of support from earlier editions.
My players are not ready to abandon 5e yet, it is now up to me to prove that this system is good, and be able to run future games using
it.