Well, they have a month to perfect week 1 and 2 dances, but just 1 week to learn the week 3 routine. So I agree with others it is really too early to say in terms of dancing technique.
However, I agree with cantos that Felicity has shown improvement and I will also add Ann and Peter to that mix, but they are the three (remaining) contestants that had the most room for improvement at this early stage, so no real surprises there.
With regard performing however, Patsy had a self-made mountain to climb and it took a lot of guts to come back the way she did week 2. Even on Saturday when she missed the opening bars to a difficult routine, she kept the performance going despite being behind Robin (?) the whole way through. She has a lot of guts and I think once she absolutely nails a routine, she could be a joy to watch. In short, I think she has made the most progress in terms of mental breakthrough.