Greetings,
I got my K4 in and I took a minute to snap a few side by side pics with my LS6 (V2ish), K4, and an older (Parks?) Ep IV Ben saber. I've not installed the K4 yet, but I've got parts on order!
From the pics, you can see that the K4 is definitely the best version.
Hope this helps someone who is looking.
Thanks