Bro, with the passage of time you will understand! Infinix is offering bad quality phones in high prices.
Moreover, their repairing costs are as much as high as Samsung and Apple. You compare an unknown brand like Infinix with Samsung which is the world's top smartphone brand. Look at their global market share, they are at TOP. Where is Infinix?. Stop comparing PakSuzuki with BMW.
Meizu and Xiaomi are offering a lot better value for money options in much less price than Infinix. They are globally recognised high quality brands, where as infinix is an unknown rip off brand.
Neither J5 is for rs. 25000/-, nor J7. I already have J5, and now a J7 too and i used thoroughly all the phones in this price, so i can list flaws of any phone i want!. Speaking about not having auto brightness sensor indicates that you do not know anything more about them as you NEVER practically tried them. They have more flaws too, which i listed few days ago.
Huawei and Lenovo are very top and value for money brands and they offer auto brightness sensor too, why didn't you purchase them? Why infinix?
I can tell you 100 legit flaws of J5 and J7, but i can assure you that they have 10000000 pros too!.
This legit news shows how overrated Samsung is. How much awards did Infinix win?
http://www.samsung.com/uk/news/global/samsung-electronics-wins-more-than-100-awards-at-the-2016-consumer-electronics-show
Don't worry bro, this is just a discussion, nothing personal or serious. We are all one family and we are all here to help [emoji4].