How is this even a comparison at the moment? For people who are actually making the comparison they obviously did not watch Imran captain.
Kohli first needs to be the best Indian captain before any comparisons with Imran. He needs to better than Ganguly and Dhoni. At the moment he is not. He inherited an excellent squad but his tactical acumen and squad tinkering is poor.
Captaincy has multiple facets. It is about player development, changing the mentality of the dressing room for the better and more importantly, winning matches. Someone like Imran made massive impact on the first two fronts - the role that he played in the rise of the likes of Wasim, Waqar and Inzamam etc. cannot be understated.
Similarly, he also changed the mentality of Pakistan cricket and left them in a prime position to dominate for a decade, but unfortunately, weak leadership prevented the 90's Pakistan team from reaching its full potential. However, with all said and done, he only has 14 Test wins. Yes it was a different era and draws were more common, but that can be used as a justification to a certain point only.
Someone like Kohli is accumulating wins at a rapid rate. He already stands at 26 wins having captained two less Tests than Imran. He has a very realistic chance of overtaking G. Smith as the most successful Test captain (wins wise) of all time. There is no doubt that statistically, he will leave Imran, Ganguly and Dhoni far behind in terms of wins and overall W/L ratio.
However, when it comes to player development, he has a lot of catching up to do with Imran, Ganguly and Dhoni, but we need to consider the fact that so far, he has captained a team that has been largely made up of his age group. The likes of Rohit, Rahane, Dhawan, Ashwin, Jadeja, Bhuvneshwar, Shami, Ishant etc. are from the same generation.
This player development aspect of his captaincy will be tested in the next 5-6 years. At 30, he is now at a stage where he is inching towards the end of his career, and India is slowly transitioning towards the future generation by integrating the likes of Shaw, Pant, Gill, Samson etc. in the team, players who are a generation younger than Kohli.
The progress that these young players make in the latter half of Kohli's career will determine the player development aspect of his captaincy stint. In terms of impacting the culture cricket, Kohli has already been very influential. He has inspired a generation with his dedication towards fitness and it will serve Indian cricket well long after he is retired.
At this point in his career, Kohli is perfectly positioned to establish himself as the greatest Asian captain. The only two things that stand in his way are a World Cup trophy and mentorship in the last few years of his captaincy. When you put these things into perspective, this is far from an outlandish comparison.