Digital BW, The Print

I got a quick response to my sharpening question on the QTR Group,
supporting my observation of an issue with QTR sharpness. 

(note: I've tentatively addressed with "smart sharpen" in shadows,
more sharpening than required for Black-Only...I'm not happy with the
extra sharpening)

I wonder if anyone's compared 2200 Black-Only to 2400, sharpness-wise?

I'd assume the same sharpness can be accomplished with 2400, but do
files that print well via 2200 in Black-Only require extra sharpening
to rival that sharpness using a 2400 ?