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I have to say that I have ridden two up and granted our combined weight was closer to 300 lbs than 400 lbs, but found the Tracer 900GT very similar to my multistrada 1260 and a smidgen less comfortable than the R1250GS.
I agree - for two up a bigger bike with more power would be better. If you ride 2 up all the time than get something bigger. If you ride two up once a month, I would think even the Tracer 9 would be fine. IN any case, I don't think it is a whole category down from the Suzuki...maybe a quarter category down :-)