I'm actually asking that of myself too. The 5400 definitely has a
different colour balance to it compared with the 4500 / 5700. The
4500 is great for capturing flora / fauna, not too great for skin
tones. I prefer the 5400 for skin tones, but flora / fauna taken
with it somehow seem to have less "pop".
Coming back to the D70 / D100. I'm not too familiar with the D100
because I haven't seen as many full-sized pics from it as I have
from the D70. And it is my personal opinion that I really, really
like the D70 pictures from all aspects, colour balance, tonality,
contrast, sharpness & definition - simply amazing.
I think you're right about "familiarity" - personal preferences
weigh in very heavily here:
Examples of my personal perception of pictures from other DSLRs:
=========================================
D2H - yellowish skin tones with flash, but I've seen PERFECT skin
tones with D2H too. Ultra-high acutance and sharpness
D100 - pretty similar colours compared to the 4500 / 5700, so, no
complaints from me

). JPEGs slightly softer than the D70's.
10D / 300D - yellowish skin tones with flash. Bokeh-ed highlights
have too much cyan in them which I don't like. Too harsh a
transition into highlights.
To cut a long story short, yes, I agree with your theory

).
... and not to confuse anyone... Could it be a matter of
"familarity"? Steve and David, you guys might remember when I first
got my 5400, I notice a green cast (even with manual WB) and I was
trying very hard to make the "look" of the 5400 to match the
5700.... I even came up with my own "warming cards"!
Sometime ago, a Fuji S2 user emailed me and asked me how to correct
the green cast in the S2. I thought it was a WB issue and when I
saw the shootout in Imaging Resource, I also notice the cast....
I suppose every CCD has a different colour cast, just a matter of
which one suit you, or which one you will get used to (just like my
5400).... On that note, one might say that the D100 has a "reddish"
cast

))
--
Regit Young, FCAS Member, PBase Supporter
48 species caught, 802 species to go ...
'Seeing and interpreting are entirely personal processes' - Steve
Parish
http://www.pbase.com/regit
--
Rgds,
David, C P 4 5 0 0 (see profile for more info)
http://www.pbase.com/dlcmh/
C.P.5.4.0.0 - Personal Experiences :>
http://www.pbase.com/dlcmh/cp5400_experiences