I do not think so. For shooting architecture the bigger the sensor the better. That is why many top architectural photographers use MF cameras. M3P having 3 different cameras also offers additional creative options. The QB sensor on A3S is...
Happy with my M3Pro, have nicely aligned cameras meaning predictably sharp corners at play. But, if the M4Pro has greatly improved still camera specs and I am able to shoot say 3x3 or 4x4 grids in DNG with the telephoto lenses for stitching...