Regarding Ads:
As Sun is NOW pay channel the revenue stream is transferred from adv. to subscription. So they show very less ads as additional revenue. In that also there will be their own programme ads, dinakaran, kungumam, comedy thirai and so on. So Sun can sustain with meagre ads and they do telecast only very less ads during movies. But Kalaignar
tv is a FREE to air channel, they are sustained largely by ads. ( Ofcourse through Karunanidhi's Political money

as well). So eventually there are too many ads in Manada Mayilada and in movies
Regarding Clarity
Sun has superior quality, no doubt in that. But unfortunately the quality of Sun in Dish tv is very poor with too many pixelations. (This can be observed if u watch bit carefully). The reason i feel is that Dish tv has allotted very poor bandwith in their ku band system. But Sun clarity is awsome in Sun Direct . Kalaignar tv is good, infact better than Sun in dish tv as it comes as a part of DD direct and DD has taken good care to allot good bandwith in their Ku band system.
As far as i have noted K, Sun
music, sun news, Chutti has better clarity than Sun in Dish tv, which is really surprising