It's a short story for the lone retested AC3200 class router, Linksys' EA9200. Ranking didn't change; it retained its bottom rank of the three products tested. The Ranker Performance Summary below shows #3 ranks for all three wireless sub-rankings.
Linksys EA9200 Ranker Performance Summary
Comparing 5 GHz downlink throughput vs. attenuation plots for the three AC3200 routers tested, we can see a definite improvement in the EA9200's overall throughput vs. attenuation curve and later disconnection.
5 GHz downlink throughput vs. attenuation comparison - AC3200
On the other hand, 2.4 GHz uplink performance actually got worse at higher signal levels (lower attenuation values).
2.4 GHz uplink throughput vs. attenuation comparison - AC3200
The gallery below has a full set of before and after plots.