Useful thread. let me give my experience with the local kastam.
Digital Camera and lenses : imported a few already from US, UK. None were taxed. There was only once it was held in KLIA customs, but went there to open in front of the customs officer, confirm no tax, only need to pay a RM18 fee (#($*&#*&^&&$#)
iPhone : no tax confirm, but you will need to go to apply for GSM permit from Sirim in Shah Alam. RM100 for a permit of 3 same models. (Must only be used in the same shipping, means you cannot buy 3 from different buyers)
Malaysia Import Duties