For Hermes bags and leather goods - you can see, feel and even smell the quality. There is nothing else like Hermes leather. It's immediately apparent that the pieces are crafted by a single artisan. With their scarves, the silk, the hand-rolled edges, the art, the colors - they stand apart from other accessories.
Now, in regards to K&B? They are incredible bags...and they aren't the ones for me. I have wanted a Kelly for some time (and will eventually get one), but for my lifestyle, I use sportier bags and carry too many things for them to be my go-to. I nearly went for a Birkin on the resale market, but with the top flap I would use it like a tote and make it look sloppy, so I held off, but they are gorgeous bags. I know that Birkin and Kelly 25s are super popular right now, but carry my life with me, so I guess I will be unfashionable. But I totally get the obsession with Hermes.