Great stuff Robert,
Although 960×720, I wouldn´t consider the HVX to be SD, but yes, I think it is a great path to sharpen it a bit and then using it as a base to rise the colors on the EX3 and go from there.
Let´s see if by any chance someone else jumps in with a diferent approach.
Many thanks,
dani Landau
DP/colorist
Rio de Janeiro