my gen 4 g26 will always be special to me for that reason (it was also my first firearm purchase ever)Have a gen 4 mos. Love it. Im one of those weird people that wont make the generational change because i love the finger grooves.
I really feel that out of the box the gen 5 trigger is superior. Take a look at the safety plunger, on the gen 5 it has a nice slope to it where as all the earlier generations are the mushroom cap. I definitely feel like that helped the trigger a lot. Whereas the Apex made a huge difference in how much I like the gen 4, it didn't help that much with the gen 5.I had all gen 4's. Not unhappy with them. Finger grooves were not an issue.
I have wanted a G45 for years and my wallet finally aligned with one for sale. I picked up a gen 5 G19 MOS to match up with the G45. The fact that the slides will swap to use the MOS system with the G45 is handy.
I like the gen 5, although I have limited range time with it. I always wanted front serrations and now that it is standard on the gen 5 the deal was sealed.
I've always run Talon grips on my gen 4's, but I'm trying the gen 5's more aggressive grip pattern without them. Can't help but notice the lack of slide finish holster wear with the gen 5's compared to the easily rubbed off gen 4 finish.