. I would like to point out that, at least to me, it is a misnomer in that the 'Finest Detail' setting is only useful for vector art and graphics.
Well, not really a misnomer ... to quote from the user manual
"Finest detail for sharper edges on vector-based data including text, graphics and line art. (This setting does not affect photographs and is not recommended for large files)."
I"m not sure exactly what algorithms are used by Finest Detail, but it is sounds like there is an attempt to identify specific edges of vector graphics, and other than that the data is not modified. Not sure what you are seeing. I also don't believe in up-rezzing to send the data at 720 dpi - I tried that sometime back and felt there was an artificial "sharpness" for many prints ... they looked "digital" to me.