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If you have a "adjusted" z4.. no real reason to go z5. If you calibrate the z4 the picture quality is so close to identical I can not see any difference.(if there actually is any). the output level is so close that it really isnt a factor either, remember 100% increase is equivalent to one F-stop on a camera. If you dont have either "no Brainer" Z5 (unless you dont mind spending a couple hours calibrating, recalibrating the Z4. both are practically the same projector. same replacement bulb, and almost exactly the same features.