I really liked the sound from my 2011 Fiesta SE with the Sync radio, non MFT. It was the first vehicle I've owned that I didn't feel that the audio system was severely lacking. I had previously owned older Audi/VWs that for some reason would never have a speaker larger than 4". I always had added a subwoofer to my cars and the SE didn't seem to need one.
On the SE Sync radio I had it set to driver listening position preset and Rock on the preset EQ. For me that provided the best sound.
A few things about the ST Sony stereo after a few days of using it.
Phone / media player integration seems better than my SE. It just seems to work better with my iPhone.
There are no EQ presets. You need to adjust high/mid/low manually. I find I need to turn the mids/highs down 3 clicks and the bass up 3 to get it to sound close to my old SE.
I can't get it to sound right with the driver seat listen position preset, I just fade right a few clicks.
The only real complaint I have about the system is the Sirius audio quality. I didn't realize that the compression Sirius uses is so high. The highs just seem wrong and I can't use it. I won't be renewing the subscription. This isn't a fault of the radio though, just what it is being fed.
Overall it is a great radio. I think the adjustments will let you dial in the sound the way you like. Short of adding a sub if you want mega bass and I can't see justifying the weight, space, and electrical drain penalty.