GX1 vs G3

Hi,

I was wondering, what are the advantages of the GX1 over the G3, especially if I was planning on having the viewfinder as well?

I see that the G3 is already quite compact (smaller than the G1 & G2). Would the GX1 with the viewfinder be much smaller still? Any other advantages? Or is it mainly aimed for those who don't need an EVF all the time?

thanks.