source file 1 is a 450d .dng format, both use default parameters except temp and tint, which is manual set to 5400k and +7, c1 uses a dng neutral color profile(450d generic is totally uncorrect in color) as import, acr4.4 can not assign import profile. both use adobe 1998 as export icc profile.
again the sharpen parameter is very different in them, c1 have a big value but not much effect, i have to pull it all the way up but still not that sharp(maybe it's because digital backs normally dont have an AA filter, and c1 is mostly designed for the digital backs), so at last I'm bored and just leave it there and as you can see they are quite different about softness, and this is not the issue at all.
light source is diffused sky light and a metz54 with umbrella(which tend to warm the temp)
source file 2 is a sinar emotion75 .dng format, both used generally the same parameters except sharpening.
hope this can help.
btw lightroom is used as host program for acr4.4.
dustblue