edit: some pics- note the windows and function keys didn't fit and are from the original set of keycaps. you can see a slight difference in texture https://pcpartpicker.com/user/yoonie/builds/#view=CTRG3C
I already bought a set of PBT-POM double shots as soon as I got my K65 but if I hadn't, I would be very interested. If the price is similar and the quality is superior I would consider upgrading in the future.
PBT-POM was very important to me since it really allows the LEDs to shine. I got the vortex ones for around 40 and would hope for a similar price from corsair.
2nd edit: forgot to mention that the vortex pbt poms light up the symbols above the number keys but not the number keys themselves (for example, ! and @ but not 1 and 2) which is a bit annoying. If that was addressed I would definitely buy a set from corsair.