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Reason I feel for you, OP. I personally traded in a 2010 Roush 427r for my BRZ. Supercharged Mustang GT, full Roush track suspension, basically the best of 2010 without getting a GT500 from that year... After driving the BRZ I couldn't walk away.
My BRZ handles miles better than my track-tuned Roush ever did, even with lightweight 18" wheels on 285/30r18 Toyo Proxies r888's. The BRZ is a much better drivers car overall. What I miss downgrading from 500whp down to 165 at the wheels makes up in how much better the car handles.
I do not recommend anyone to trade in a twin on a Mustang, even a 2015 with IRS (test drove that too and the BRZ was still superior handling wise) unless you are specifically wanting straight-line speed. Note that you do not use that power all the time, and 99% of the time you're driving you are commuting. This is where you notice the improved handling and ride quality, and I'd personally rather have a car that performs better 99% of the time rather than that 1% I'm at WOT banging through the gears.