I don’t think the SR had a different suspension set up to the S SE and SE-L models. It was just a base model with the GFX body kit, so it should ride the same. I have never tried an F-Sport 2IS but had both a 2007 and a 2011 SE-L. In my opinion, the ride in the 2007 was marginally better than the 2011, most likely due to the smaller standard 17 inch wheels. I also found the steering to be heavier in the earlier car, which I preferred.
Personally I found the leather to be of better quality in the 2011 car. The extra rear leg room was due to a change of the front seat back pocket design. The earlier cars had a ridge pocket that could be pulled forward, where as the later models had a material based version. Again the gain in leg room is minimal. If your kids are young enough to still be in car seats with an iso fix base , then we found the Maxi Cosi range to be a very tight fit. I had to move my seat forward in to a compromised driving position and I’m only 5ft7.
Good luck with your search. Both cars were absolutely brilliant.