For the winter I just replaced my OEM 17" wheels and Yokohama Geolanders with OZ Alleggerita HLT's shod with Goodyear Ultra Grip Ice WRT's in the same size. Unfortunately it got dark before I could snap a photo.
But I can report that the car lost enough weight that it feels even perkier during acceleration. The difference was far more than I would have guessed. It just feels zippier, especially noticeable around 30-60 mph. This was the best mod I can imagine doing to a CX-5. I think when the Geolanders wear out I'll look for a lighter set of summer tires (and maybe another set of aftermarket wheels).
I weighed all eight wheels with the tires mounted. While my snow tires are spec'ed as 1 lb. heavier each compared to the Geolanders, I still lost a total weight of 21.2 lbs. Based on the tire manufacturers specs, the weight certificates that came with my new wheels (weighed to 1/1000th of a lb.) and adjusting slightly for the 3000 miles on the Geolanders, I estimate the OEM 17" wheels weigh about 22 lbs. each. This means one can save around 28 lbs of wheel weight by switching to aftermarket rims in the 14-15 lb. range. That is enough to really feel the difference in acceleration. While I think the acceleration with the OEM wheels is more than adequate for normal driving, I like this change because it means I can accelerate faster with less need for downshifting.
I'll post pictures of the new wheels mounted up in the next couple of weeks.
Oh, I'll add that the new snow tires have slightly more road noise but I don't think I would have noticed if I were not specifically listening for that.