You got to be kidding me.. wait for a month... then sell both phones and get yourself a HTC One!!! 

Interesting... your job requires you to 'show off'? hehehehe... that's kinda cool

Well, in that case, it's really about perspective eh? I'm sure you're not particularly into S III but you like the android experience right? So, you're actually looking for an android phone vs an iPhone 5. So, if you think that the S III in itself doesn't really give it much cosmetic oomph for your career, then you can do a few things to give it that superficial look to wowz the crowd around you

1. Get a radical casing that wraps the android phone. particularly the SIII, you can look for otterbox defender or some other radical casing that changes the whole look of the phone till some don't recognize how it looks like. An otterbox user myself, my S III (which kononnya to you doesn't have much of a wow factor) is always being ogled at and asked by friends to see "What phone is this?"

2. Can always get another android phone that has a better chassis right? You sound like you can afford anything at anytime... so just go for an HTC One or another Android phone that looks aesthetically approving to you. I've seen some phones like the Sony Xperia Z that honestly looks way classier.

p/s: If you want something that really appeals to the crowd, I see MORE AND MORE people lunging the huge Galaxy Note IIs around. Apparently HUGE phones are the hit now. I think iPhone is.... well playing catch up these days

If I were you, I will keep the iphone5 a little longer. Why? Once the s4 or even Note 3 are finally here, I will sell off iphone5.This is because your iphone5 won't suffer much of price drop on the arrival of s4.