Since the Indian employee has a good track record and the company is willing to transfer him to US, lets assume that he has around 8-10 years of experience.
This would qualify the person for about INR 2 to 2.5 M annual pay excluding commissions. This is about USD 35 - 40K
For such a pay, the quality of living of the Indian person would be
(might vary slightly based on the city in India)
1. Owns at least one 3BHK house / apartment right in the middle of the city (~ 10-15 minute commute to office) with groceries/malls within walking distance or max 10 mins drive
2. Drives own car (atleast Honda City, Ford Fiesta, Hyundai Verna), with a good chance of a second car
3. Owns some of the following: iPhone, iPad, Samsung G S4/Note, smart tv, home theatre system, a modern kitchen, full internet connectivity, power backup
4. Good chance of at least one child and that child studying in a leading private school
5. Has a paid help for daily chores (washing, cleaning etc.)
6. All labour for any domestic purpose electric, plumbing, car mechanic etc. are all down right affordable without even a pinch
50K definitely is higher than the 35-40K USD he is receiving and it is upto the person to accept it. However, the person would definitely be compromising as I doubt if the 50K USD will assure the above list when the person chooses to live in the US