S4 is worth 10k more if u can afford otherwise ZR is great for 27k
S4 is available for 34k, i think
The cheapest I could find S4 is for 35275 and ZR for 26864 /-
If you can afford the S4 then do go for it, in the long term you'll receive more OS updates with it being a flagship model and also has a better camera and screen.
So, spending around 9k more gets me the following :
1. More Updates : Definitely an edge over ZR.
2. Better Camera : ZR's camera is not that bad either. Moreover, the saved cash can fetch me a dedicated camera which I am sure will take better pictures that S4. So no use spending 9k more for better camera.
3. Screen : Yah, S4 has a bigger and better screen. Agreed. But is the difference that huge? Moreover, I have small hands and I really think a smaller phone would fit better in them.
4. Battery : From what I get from the reviews, S4 has a better battery too. But then again, its just a minor enhancement given that ZR's battery doesn't really suck.
Now, the positives of ZR over S4:
1. Cheaper
2. IP55 and IP58 certification : Though this is not a deal breaker, yet it always more comforting to carry a phone that is resistant to dust and water.
3. Looks : This one is a matter of personal choice. S4 looks pretty much the same as it's predecessors and this is my major complaint with Samsung. Personally, I like ZR better in looks, esp the illuminating light bar at the bottom.
Please correct me if I went wrong somewhere or missed any point.