Good advice on the file work. I'll do that tonight.
I love Opinel #8s. When it comes time to cut down a cardboard box, I still do the following:
Grab 3 of my one handed folders for a cutting competition. All three cost more than I'd like to say. I get pissed off at each one of them in turn. I put down the knives, go upstairs to my night stand or in my garage, grab an Opinel #8, and finish off the boxes...always commenting on how scary sharp they get. Next I sharpen the Opinel which takes all of 3 minutes. I'll then carry it for a day or so, but get tired of the bulge in my pocket and place something more pocket friendly in there. They are finicky and I have a process for each new Opinel that takes about a day. Involves drying out, placing in a mason jar of mineral oil overnight, getting rid of excess mineral oil. If carbon, forcing a patina. It works very well, but it is a process.
I can hear that jingle as I type this. They do very well with advertising. Simple, elegant, rugged. Makes me want to go hike the alps and have a picnic with some cheese and fancy salami. SAKs are still more useful, but I'll always have a place in my heart for Opinels and occasionally get miffed at myself for spending so much money on fancy folders when my Opinel does EVERY cutting job better. Trim small limbs that hit me in the face when mowing, prepare dinner/picnic lunch, garden, and break down cardboard boxes. I saw a post you typed about the SAK floral knife being just as good of a slicer. Those are strong words...very strong. I might have to purchase one now for a cardboard competition.