I hope that your are aware that CF on Stretch, Sage, and Caly/Native have different finish. Stretch has peel-ply CF, Sage has twill, Caly3 and Native have smooth, almost polished CF. Stretch will provide you with the best grip, but not the best look. Sage will have medium grip and in my opinion the best looking CF, Native/Caly least grip and nice look for gents knife.
Also Stretch and Native are discontinued, so it will cost more to get this two.
Stretch has solid ZDP blade steel, Caly has laminated ZDP (blade with very hard core, but scratches easy), Sage S30V, and Native VG10. Sage has liner lock, the rest are midlocks.
I never owned CF Stretch - I really do not like the blade shape. I owned Sage, but sold it, I do not like blade shape either. I still own CF Caly3, but I hate uneven laminated lines on the blade.
CF Native4 is the winner of my heart. I love the knife. I used to have two, but in the moment of insanity sold one


. Great knife, great ergos, good steel and looks good. Very good EDC.
I've owned all of those except the CF Native (which I've owned the FRN version of)
I think that this is not exactly correct. CF Native4 has different blade than any FRN Natives: it is FFG, which performs and looks quite different. Also no swedge.