S6 Clone or not ?

Hi,

I just bought a new Galaxy S6. Looking good, but I feel that the Phone is sometimes a bit laggy in navigating on the screen.

I have seen loads of videos where visiual checks are done, but still not sure.
I ran Antutu benchmark to validate specs:
Is there somebody who can say wheter this is Original based on below information:

Brand: samsung (no capital ?)
Model: SM-920F
Android: 5.0.2(32bit)
CPU Model: Quad-Core ARMv7 Processor (VFPv4, NEON)
Renderer: Mail-400 MP
Resolution: 2048 x 4096
Rear Camera: 8,0 mega pixel 3264x2448

I thought it should have octocore, not 4 and the camera should have 16 instead of 8 right ?

IMEI check shows unknown on the web, SAMSUNG Kies 3 is unable to connect.

Is there a uniquely way of indicating the originality of the Phone ?

Thanks.