Hi Pankos,
You can check the specs of your phones and their CPU's.

Phone comparison: http://www.gsmarena.com/compare.php3...&idPhone2=6373
CPU comparison: http://system-on-a-chip.specout.com/...-212-MSM8909v2

Conclusion: The CPU of the Redmi S1 and the Intex Aqua Fish are not much different. The CPU of the Lumia 920 is a Dual core. The Redmi and the Aqua Fish both use Quad core CPU's. The Aqua Fish has 2GB of RAM, while the Redmi S1 only has 1GB.