The more I look at it, I think the shadow on the ZXi5 photo makes the difference look like more than it actually is. Definitely more meat on the R, as there should be, but it's not a shovel by any means. I'm really eager to hit these irons and see what that new material feels like.The ZXiR is thick compared to the ZXi5. The trail side chamfer on the 5 does a good job of optically hiding how thick the club is. The R doesn't have that.
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Blade length between the two looks very similar, with the R being a little longer. It has a more rounded end to give it that little extra.
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