I have flown this route on Air India a couple of times and find the following
1) timings are great
2) depending on the time of the year flight is either packed or half empty
3) Air India economy by far has the widest seats with the most pitch and are very comfortable
4) the 787 seems to be crewed with new younger hires and are non union so they are quite pleasent.
5) the selection of beverage is average unless you a whiskry drinker
6) Food average
7) service: well i am the kind who hates being disturbed many times wih announce,ents and over service. I appreciated the hostie telling me at beverage service when i order a beer, take 3 or 4 so i wont need to keep coming back and disturbing you
8) overall i fly it cause it saves me time and money and the Dreamliner is a good aircraft. Most importantly it arrives and departs at all points at decent hours.