On one of the gun forums there was a guy doing a directory for handguns sizes. Basically trace drawings of handguns (collected in PDf format) using a common scale so a potential buyer could have an idea of whether a listed handgun would fit the dimensions of their hand. Also by listing a large number of common guns one could compare sizes to determine comfort. So for example if you own a 1911 and find it comfortable and then you know other guns with similar dimensions will likely be comfortable too.
I'm sure this could be done with knives too.
I know with computer tech today 3-d modeling is possible but really it doesn't have to be hi-tech.Manufacturers could do simple shots with a ruler scale in frame or just do group photos of their various knives. So for example maybe you are interested in a Spyderco Manix but have only handled a Delica, voila heres a pic with Manix and endura both!
This is not perfect i know, nothing replaces actually handling the item but still it would usuable and give some info to go on,it certainly would be better than nothing.

I'm sure this could be done with knives too.
I know with computer tech today 3-d modeling is possible but really it doesn't have to be hi-tech.Manufacturers could do simple shots with a ruler scale in frame or just do group photos of their various knives. So for example maybe you are interested in a Spyderco Manix but have only handled a Delica, voila heres a pic with Manix and endura both!
This is not perfect i know, nothing replaces actually handling the item but still it would usuable and give some info to go on,it certainly would be better than nothing.