Depends on your definition of slow, and what you expect from the car.
For me, I couldnt justify spending over £1,000 extra for higher road tax, higher insurance, less mpg. I only really drive around the city, which the 1.2 does fantastically. Definitely better than my 1.6 Focus. The 1.4 also has a bigger turning circle, which (arguably) makes the 1.2 better for city-style driving. However, trying to overtake on the motorway in the 1.2 when you're doing 60-70+ needs careful consideration as unless you're going downhill, theres not much room for acceleration.
All things considered, I dont miss my Focus. Except the heated windscreen