I bounced off of 5Ed during the prerelease revelations. Never spent a cent on it.
So I have no idea how many of the late-era 3.5Ed PCs I made were capable of having reasonable, playable 5Ed facsimiles made of them. I know not many could be easily built in 4Ed, and goodness knows I tried.
That said, some of what I came up with in 4Ed wasn’t easily modeled in 3.5Ed, or was flat out better with the 4Ed rules. (I especially appreciated the 4Ed’s Warlock over its predecessor.) And in fairness, I’m certain that 5Ed’s rules would have found me trying out certain things that would have been unwieldy in 3.5Ed or 4Ed.
You can do a bit more with 5e now than you could when it started. They've added a class and some subclasses, but nowhere near what 3e provides.
With 3e the sheer number of classes, prestige classes, skills, feats, and races means that you can make almost any concept you can envision.
There are something like 115 subclasses in 5e. 3.5e has something like 750 prestige classes, and those prestige classes can be fit nicely on multiple different classes, unlike subclasses which only work for the base class they were built for. 5e has about 100 feats. 3.5e has about 1500.
Even with most of the books put out by 5e, I can't build a single 3.5e character that I played past 5th level, and even then I can't build most of under 5th level. The different feats and class abilities that just plain don't exist in 5e makes it pretty much impossible.
As an example, take Hide in Plain Sight. In 3.5e it was an ability that let you roll a hide check to hide without any cover at all. The ability doesn't exist in 5.5e that I can tell, and in 5e only a ranger has it and even then it takes 1 minute to do and you can't move. Basically it's Arnold in Predator covering himself in mud and being still at the mud bank. And you have to be 10th level to do it. A closer ability is the 5e wood elf ability to hide in light cover, such as rain or dim lighting. 5.5e got rid of that ability as well, though. One of my characters is a drow Rogue/Shadowdancer that I think is 6th level. That one ability to hide in plain sight as a 1st level Shadowdancer means that 5e can't make the character. He's not a ranger or 10th level, and he's not a wood elf, so I can't even get close to that ability.