I agree. All car seats are different, so it's hard to guage without actually trying it out. I do it myself - bring the wife & all the kids + car seats + all the usual buggies & gear to the car dealerships to try them all out. It's the only way to really find out.
Great car, very roomy all over. My wife has one and we are delighted with it. Much more spacious that some of the competitors. Huge, comfy front and back seats.