STM32F427ZG and CMSIS FIR Filters

I am using STM32F427ZG and have a query about the CMSIS FIR Filter functions. We require
highest possible speed in a 16 bit environment. I have been comparing speeds for the q15,q31 and
float32 FIR filters. The STM32F427 has floating point hardware, but I had hoped the q15
implementation of the filters would be faster than the q31 or float32 due to the SIMD
instructions. However I am finding that they are all very much the same speed, if anything
the float 32 is slightly faster, This applies at all levels of optimisation. Can anyone
advise me please?

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