I'm not a pro with all the benchmarks thing, but I just tested my late 2015 27' iMac (actually, it is the first time I do a benchmark test just to compare with yours) its the base model with Fusion Drive also. and I dont find the difference to be so ahead of mine to feel I need it.
Multicore is at 13 170 and single core at 4546.
[doublepost=1498296167][/doublepost]Wow, I do another test with all applications closed :