I haven't tried diamond lapping film, but I tried the alminum oxide film (gift from one fine Seraphim). I found it great at sharpening a couple edges that I had trouble with on hone (a big wedge and a le grelot). I didn't find the edge as comfy as I do off my coticule or escher, but could get there with a TON of latigo stropping. But the films seem to combine the efficacy of a pasted strop but the mechanical soundness of honing edge first. Maybe diamond film would be silkier, but for me the film is a weapon to deployed when I'm struggling, but if I'm winning iwth a hone I like the fell off the coticule better.