Nah, it's actually the same size as the 3IS. :)
The Infiniti Q70 competes with the GS.
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True, the steer-by-wire system does have polarized opinions (like most new tech). Although I have a sneaky suspicion that many can't look past the fact that because the steering is disconnected from the wheels, it "ought to" have a vague feel to it, or something is wrong :P
There are those who like it though, like CNET and drive.com.au so I guess it needs a little getting used to, just like driving a hybrid car itself (steady deceleration to maximise on regenerative braking, etc).
And if it's anything like my aunt's Murano, that 3.5 V6 is a gem of an engine; it certainly feels more refined than the one in my GS (which sometimes feels compelled to sound like a diesel...)