a pic will not show the 3mm decrease in size of the grip. the sf has a decrease in the backstrap to the trigger ,not in the width of theg rip. i had both models. now i only own 3 g30's 2 older ones without the rail and one newer one with the light rail. dumped the sf. i cannot tell the difference because my finger reaches the trigger with length to spare on both styles. the sf model might feel slightly smaller to your hand. 3mm is 3mm afterall. it just don't represent width as much as trigger reach. it's funny because i enjoy the regular ,non sf g30 and then i choose the 21sf instead of the conventional grip g21. go figure all in all the glock .45 platform is the softest shooting most accurate combat ,sd rig i ever fired. most reliable to.
keep looking until you can put both in hand together for comparison. not something you could get opinions on although opinions are interesting.