I've spoken a bit with the fellow who runs kimbawlion.com and am under the impression that the 80's series is a bit out of control, with most of humor from Kimba gone (though hopefully I'll get to see some of it.) Only a few episodes were completed under Tezuka's direction before his death, so who knows?
Went back and reread some of the manga, which leaves me even more confused. While Kimba is clearly toned down from the manga, a pretty high ratio of fluff, and a garbled translation, it still may be closer to the tone of the manga than anything else. I am REALLY enjoying season 2, but after going back and rereading the manga, I've realized it doesn't just completely ignore the manga's plot, it actually ignores the whole feel of it. It may be that season 2 is more a reaction to all the concessions made over season 1, and ended up going too far the other direction. Again, I'm enjoying it, but despite claims that season 2 is closer to what Tezuka envisioned for the anime, it ultimately ends up having less to do with the manga than Kimba did. WEIRD!
So here I'm stuck. I'd take the manga over either season 1 or 2, but both have some pretty serious strengths, and honestly, both seasons AND the manga have their weaknesses. I love them, but I keep wondering how to introduce people to this work...? Probably best to start with something else by Tezuka.