| | I would agree that the RX-5000 has some advantage to the SX-8000 and I put the differences down to mainly the air bearing and construction of the platter which will  cause softness  and a lack of focus (some people may like this). To understand the use of a metal mat you have to understand a constrained layer damping which is a common engineering practice. But in my humble opinion  both these tables are superior to the AF-1. The AF-1 suffers from several problems a) a motor system that has insufficient torque, b) a suspension system that is incomplete  c) an inefficient  arm mounting system which has been corrected in the AF-3 and as as someone else put it it too much 'bling' for it's own good. Look at the updates that have gone into the AF-1. Problems that they will try to fix in the upcoming AF-0.
 Technically the AF-1 might look good on paper but in my opinion it removes the soul of the music being played. A classic case of a product being released before all the bugs were ironed out. A lot of modern products have taken a step back because of desire to introduce new features that are questionable at best and discard tried and true engineering practice.
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