For performance comparison, Check HP power per tonnes or kg to see Which helo is superior to another, If you really want to consider weapon carriage capacity, rate of climb and some other factors which is directly related with power on per tonnes/kg.
Similar class helicopters:
T-129 Atak: 550hp/tonnes
AH-1W SuperCobra: 505hp/tonnes
Eurcopter Tiger HAP: 390hp/tonnes
CAIC WZ-10: 380hp/tonnes
No need to mention hot-high performance of Atak which is specially created to provide its best against armed assymetric threats at on of the most difficult terrains of the World. That's why Atak is light but heavy armed, highly manouvrable platform.
For armour protection comparison, Do anyone know Which calibres AP munition T-129 Atak stand against ? What about WZ-10 ?
For Electronics and EW systems, Turkish upgraded american platforms equipped with Aselsan MFD, Communication devvices and EW systems are being operated by Turkish army in real operation areas sucessfully. They are NATO class proven systems.