I had no problems with collision in the new and old solvers, there is only one: cloth normally interacted with the capsules of the legs, but completely ignored the hand (fingers) contact.
On a slow or passive animations like curtains in the wind, apex looks more or less decently. but if I run real animation of clothing on the character like for example walk or run, I get out those severe artifacts… that personally, I put aside attempts to use apex for such things.
I was particularly upset that the cloth greatly deformed on the boundary, where the maximum distance = 0. in the animation (simulation) border is very noticeable. I tried to do a brush very smooth transition from zero to positive values (0 to 0.01cm to 0.05 to 0.1), but it doesn’t work. The apex-solver believes that the cloth should be stretched like a rubber band. There’s no smooth transition between the piece of clothing that follows the skeleton and one that is calculated by the cloth-solver. And the same problem in the old solver. I checked: did everything in max, imported the old-fashioned way (in UE 4.14), the result was exactly the same visually bad.