I didn't watch the first part of Jolly LLB starring Arshad Warsi. But I've heard pretty good reviews of the movie. The second part was a bit controversial when the makers decided to cast Akshay as the lead and up the stakes. Fans of the first movie were pretty vocal about this decision, but Arshad decided to stand with the director.
I am not in a position to comment about the differences between them, but the second part is a good one time watch. It tackles a serious issue in a semi serious manner, satires the legal system in a healthy way without getting preachy and never loses focus. The story is nothing new or original. But the narration is thankfully devoid of clutter.
For a change Akshay never try to go overboard with comedy or action, even with ample opportunities present. That decision turned out to be a wise one. It is the supporting cast who does a great job. Even the minor ones deserve a pat on their backs. The moments to watch out happens between the judge, played by Saurabh Shukla and the opposite lawyer played by Annu Kapoor.