The only real things the rev2 has on the Take5 are splits/layers, a 2 pole filter, and more LFOs/envelopes. Some of that is really cool, no doubt (and why I haven’t been able to part with mine yet). The 5 has more effect slots (even if two are always set to reverb and distortion), types, and the vintage knob for when you feel lazy (that will tweak envelopes I think - slop won’t). PWM is sort of meh on the take5, but there and usable.
I do think the rev2 has a nicer keybed. They are both nominally the same model of fatar but it ain’t quite the same. Still a very nice keybed in the 5, though.
I actually just had to replace the main board of my take5; rev 1.1’s apparently suffered from the “powered usb hub might brick your synth” issue. The newer rev 1.2 replacement has what looks like a resistor next to the USB port that wasn’t there before. As a “bonus” all my presets are gone, but now I get to make new ones!