Looks indeed that the ea7 outperforms the mzx500 where it comes to sound quallity, by quite a margin.. Tough the. Mzx might still have an advantage when it comes to features and interface.
The hammond SK1 is an incredible fun formfactor... But not an arranger, unless you add the Ketron SD40 (2 kgs) to it.... But then performance instruments like the SK1, or Nord stage make a perfect arranger base in combination with the SD40...