Currently... There is no size limit of check-in luggage... However, for weight of check-in luggage, that is restricted to 20kg only... So as long as it in under 20kg, its size doesnt matter...
Regarding to hand-carry... You are allow 1 piece of hand carry which size is within (56 cm x 36 cm x 23 cm)... And for hand carry luggage, you will only allow 7kg of hand carry... But usually the check-in staff will not check, as long as your hand-carry luggage doesnt looks too heavy...