I understand that 5e has flattened the curve significantly, but characters will still achieve (at least demi-) godlike powers by the time they are level 20. I'm interested in a more gritty setting, where death is final and non-magical characters don't achieve anything obviously supernatural (so magic users should be limited as well).
In 3.5 I've played E6 (a variant where 6th level is the "epic" level, and level stops increasing afterwards), and found it a decent match to my expectations. In 5e, would E6 work pretty much as originally designed? Would it require changes? What level should it go up to for a similar feel and power level?