least used is my wusthof/henckles kit from back in the day when I worked the line - 20cm and 26cm chef's, 10cm and 16cm utilities, 26cm slicer and 16cm boning. these are the old 3-rivet full tang black handles (which is all they made at the time- I think the grand prix were just starting to come out but weren't widely in use - yes I'm old)
wife uses them, so they're still front and center in the sharp drawer and I need to keep 'em sharp - one of hte utility knifes is ground a few cm short these days, so I use it to open bags, cut plastic sealers, etc.
but I really haven't used them seriously for many years.