J series is now modified into A series. M series is a totally different category phone. It's budget friendly series. I know it's quite disappointing. But still. If you want knox security you have to go with A series. And if you are okay with big battery life with restricted features then M series is for you. And M series is specially for online market and A series is for offline market. If samsung include knox security like features in M series then they have to drag down the price of A series phones. You can feel the difference between M series and A series even by their buit quality. May be someday they'll include all the features like A series. Wait for it. For now you can only give them feedback.
