Talked to some workers there and generally mentioned that the metal skeleton material (inside concrete slab) on block B is better then block A as the supplier for each building is different. they using the similar concept as Petronas twin tower where once main con managing to sub-con with one maintaining each.
Im not sure whether its just a 'talk' by the worker or its a true or not... if it yes... hope that the build quality is the same for each building and awesome as a whole.
enjoy the pics (click to enlarge)
