S20pro and S7000 are both based on the S602z body, both are replacements of the S602z, one for more resolution, the S7000 (4th gen superccd HR) and the other for wider dynamic range, the S20pro (4th gen superccd SR).
Fuji took in much of user comments on the S602z body and did minimal modifications in both the S7000 and S20pro to improve the handling of these cameras over the S602z. Too bad, still no focus assist light.