Hiiii frnds. I think Z5 is better than his little brother and here is me reasons: Z5 compact hasn't heat pipe so it will face with more temperature, Z5 compact has more camera corner blurry problem( check Sony support from).
Z5 Compact is thicker, Z5 compact has been made of kind of plastic but Z5's is Metal and glass so it feels more luxury and feels better quality. Thank you