Digital BW, The Print

Earlier I asked the question

"Has anyone who had a 2200 and has upgraded to a 2400 done a print
witha RIP such as IJC or QTR and compaired it with the same image
done
on the same paper with a 2400. Would I be able to tell the
difference.
I am speaking of one done with just the gray and black inks on the
2200 vs one done with the 2 grays and black on the 2400.

I think all of us would like to hear opinions."

Has no one done this compairison? I'm getting really nice looking 
prints with QTR and the 2200 and I'm sure some are using the 7600 with 
QTR or IJC. Is there no one who feels he can make a judgement?

John H