I do own Kohno Pro-J from 2004 and though being for sale, she still impresses me with here wide and open tonal spectrum, profound basses, good separation and sparkling projection. But it must be noted that it should be correctly named Sakurai-Kohno, because Masaki Sakurai is now the builder resp. leader of the workshop after Masaru Kohno passed away in 1998.
Unfortunately can‘t comment on the Lopez guitar but read what James‘ comment in your other thread which sounds very, very interesting!
At the end it’s all a matter of your personal taste. So take time and keep trying theses guitars until you are really convinced that this is really the one you like and want irrespective of brand or maker.
One thing you should take care of is that they restring the guitars with the same Nylon string brand, preferably even the often criticized EJ45. This should make it easier to hear the real potential of the guitars. Avoid Carbon strings! Not in general but just for testing. Particularly the Pro-J will have almost infinit sustain with Carbon strings which might influence your decision knowing you’re coming from an e-guitar background.