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You can check wikipedia for ceilings both Mi-24 and Mi-28 have lower figures than T-129, AH-1Z and WZ-10.
https://en.wikipedia.org/wiki/Mil_Mi-28
https://en.wikipedia.org/wiki/Mil_Mi-24#Flight_characteristics
Mi-28 high altitude performance was one of it's drawbacks highlighted in the Afghan war. Mi-35 addresses this issue with weight reductions (notably smaller wings and fixed landing gear), better main rotor, X shaped tail rotor (better survivability for hits) and optimization in power plant for hot and high conditions.
Wikipedia ceiling for Mi-24 is 4900meter and below link shows 5700m for Mi-35
http://www.military-today.com/helicopters/mi_35m.htm
"The Mi-35M has a number of improvements. It differs from the basic model by main rotor system of the Mi-28 and X-shape tail rotor. Main rotor's fiberglass blades have new aerodynamic profile. These are lighter but stronger due to titanium details. Helicopter also has upgraded turboshaft engines. Flight performance such as altitude and maneuverability improved due to these changes. Stub wings were shortened in order to reduce weight. Wings have a number of hardpoints for weapons and other uses.
Electronic core of the helicopter underwent fundamental modifications. A whole spectrum of new electronic systems were adopted in the cockpit. The Mi-35M is fitted with upgraded avionics and improved sensor package, including night vision system. Helicopter is also fitted with electro-optical rangefinder/targeting system with thermal imaging guidance channel, satellite positioning and navigation system, electronic multifunction displays, onboard computer and new generation jam-proof communications equipment."
Empty weight Mi24: 8.4 T
Empty weight Mi35: 8.35 T
Empty weight Mi28: 7.89 T
max take off weight Mi24: 11.5 T
max take off weight Mi35: 12 T
max take off weight Mi28: 11.7 T
service ceiling for all: 5000 meters.
1. Mi24 and Mi35 weights are almost same, so there is no difference at high altitude for both, is there?
2.Mi-28 is lighter in empty weight and comparable in max take off weight, having same service ceiling. so where is Mi-28 drawback in weight or altitude?