DotPadsForLifeHi DotPadsForLife, I haven't tried Pilot medium, but from looking at charts I think my Lamy EF would be similar to Pilot M.
I've only used one Lamy EF and one Pilot F though, so I don't know how much is down to individual variations. I'm always surprised by the difference in line widths, when I switch between the two pens.
(Sorry to take a while replying.)
Tigermanmy pilot Mediums are still a bit larger than the lamy 200o fine I just received. A bit surprising. It is actually not much more than the EF I have. I am getting much more line variation in the EF than I get in the F nib on the 2000.