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You can certainly look at G and G Images seperately.. different animals. What would be interesting is some path tracking to see which is converting better. This can actually help in SEO decisions....

For the most part AltaVista = Yahoo

and of course these days..

AskJeeves = Ask
MSN = Live

How targeted the traffic is matter as well. I have a MSN term that drives a lot of traffic. Unfortunately it isn't really a targeted term, and as such more of the traffic is useless.... lol. So a high ranking, traffic driving term ain't always the one that converts the best.

I notice different sites and different markets vary in traffic. Generally newer sites get the MSN traffic and the Older ones have a greater percentage from Google.