owh~~~~ full frame poison~~~~~~~~ but then i feel like FF really abit too wide until i dunno how to compose...

Why are you struggling? The 2 lenses are on opposite ends of the focal range. The 24mm will give a view which some like and others don't. The 135mm is telephoto and it will have you standing across the room to get in a half body shot of someone.

So focal range do you use more of? Wide or tele? Don't just get a lens because other people say it's a great lens. The most important thing is whether you will use that lens often or not. Getting a 135mm Zeiss and letting it stay in the drybox most of the time is not a very wise way to spend RM5k.
** Edit **
Whoops! Just noticed that you're on FF..

kevinwcw : Then your choice is clear. Get the 24mm first and Sony does release the 135mm with SSM you can get it later lor...

usually fast primes are not fitted with high speed motors IINM.

Mikeshashimi: Yes that's the one. Dunno if it is free of charge or not.

kevinwcw: You have the 16-35mm already yes?

Bear in mind that the Zeiss 135mm is screw-driven and will not AF on the NEX-5 + LA-EA1. Also it's too long on the NEX-5, and not stabilized, which affects video (you can get by with a fast shutter speed for photos, but body motion will be obvious in video.)

The 24mm makes more sense on a supposed firmware upgraded NEX-5 + LA-EA1 but you already have the 16-35mm.

I would rather get the Sigma 85mm F1.4 EX DG HSM.

zstan: Not an absolute truth; there are fast-focusing primes with in-lens motors, and there are also primes with slower in-lens motors than the screw-drive version (Nikkor 50mm F1.4 AF-D versus 50mm F1.4 AF-S comes to mind.)