Whenever there's money involved, everything becomes complicated...
I think there's another way to see this.
At launch, the pro lens was like 1.2k, yet a lot of people still think it's worth the money, and those that wanted the EM1 wasn't really hesitate on getting it as the kit lens. And nowadays, the price floats around 900-1000, which can considered quite a drop in price for a 1 year old lens (I mean from the launch date).
I think if you really want the lens (I think it's a very very good lens, me myself have been "research" a lot on this, and I almost went for it!), 900sgd is really a good price for this great lens, and I really doubt the price will drop much further in short period of time. Go get it, you will make up the 100sgd difference with a lot of great photos you are going to take with it, when you look back in the future (maybe a year or 2).
In case you're wondering, I chose X-T1 over EM1 ;p