I have never shot a Z5, but I do own an X7. Depends what you want it for. It is shorter and lighter...not an advantage in a long-range ML but excellent for trekking up the mountains or hunting in woods/brush. It comes equipped with a Williams peep sight, which, combined with the compact size, is why I bought the gun. I absolutely love it for close-range work, too bad my work was all long-range with the scoped version this year.
If you plan to use the peep sights, be prepared to call the company and make them ship you a taller front sight. As it came from the factory, mine shot a foot high at 50 yds with the rear sight maxed out.
