Again back to where we started. -_-
Yureka @9k is better and more VFM than S4 @18k. S4 will not get anything after lollipop which will have crapwiz on top officially.
SD615 of Yureka, being 64 bit, will benefit from lollipop. Plus the stock rom is much better than that on S4. As far as A.S.S. is concerned, they have promised door-to-door service. Camera is best under 15k androids.
I was comparing the S4 with other phones at that price, currently. A zenfone 2 etc should be better, but thats in the future.
There can always be other phablets/tablets be way better. But for a person who has lots of large devices already & is seeking a good compact no-nonsense daily phone, I suggested the S4.
I cant deny OnePlus & Yureka to be better, but they belong to the phablet category(though it may just be a very fine line between phone & phablet).
It may not get further updates than Lollipop should be fine(for 1-2 yr usage), as many of 2013/14 devices won't other than Nexus & Moto.