I have a G17, 19, & 26 - when I got the 26 it felt funny because there was no place for my small finger so a friend told me to buy the grip extensions that fit on the end of the mag - I don't know if there is a difference in trigger reach now but with the grip extensions it doesn't feel much different from my 19 - if you don't have these, they are well worth the few $$ you pay for them.
With my 23 and 27 standing side by side with barrels pointing straight up they are identical except, ofcourse, for the shortened grip and shortened slide on the 27. They also feel the same to me.
I believe the only difference between the standard, compact and sub-compact models is length of slide/barrel and height of grip.
You can interchange Glock's trigger set between full size, compact, and sub compact. If this answered your question.
