The Panasonic P51 is a rebranded Alcatel One Touch Scribe HD. IPS display, lightly skinned (almost stock) Android. The phone is supposed to receive a few Android updates, but I am not sure if the Panasonic rebrand will get it. Alcatel phones are themselves not made by Alcatel - A chinese company named TCL holds the rights to use the Alcatel name on their phones (It was intially a joint venture between Alcatel and TCL, but later TCL bought out Alcatel's share, licensed the name and retained some of Alcatel's staff - so it's not so bad as it may seem). Alcatel phones are decent quality for the price, but firmware updates are slow and/or limited.
Additional note: Panasonic phones are distributed by Jaina group - the same company behind Karbonn. Alcatel phones are distributed by Salora. You have to see that the service experience will be proportional to the experience with these two companies respectively, in general.
P.S. This phone has oleophobic coating, though not mentioned in the marketing materials. It also has Asahi DragonTrail glass.