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In my experience, the average player will not notice any difference between the two. I played both on the same W968 and there was no change in the game on any stroke. They also both share a lousy durability to be honest.yeah it would have been more interesting a comparison between O8C and JH C52.5, both have the same sponge hardness.
For me nothing to buy a second sheet.
XIOM J&H Z52.5 is more durable, offers the same qualities in Spin, Controll and Speed, with just a tad less arc on topspins.