It's not too shabby, I've seen worse. Some of those i7's have had reported stock voltages North of 1.4v.
By comparison, my i7-3770K can do 4.9GHz at 1.32v, 74°C p95 26.6 small fft, but is currently sitting at 4.6GHz 1.216v.
So cpu lottery has a lot to do with how far you can take an OC.