Do a simple comparison to what you have now, check out
GSMArena.com - GSM phone reviews, news, opinions, votes, manuals and more... and it's all there laid out bare.
Screen size, default RAM, screen type, pixel depth, processor speed, camera capability, video capability.
Will take you approx. 5 mins to evaluate.
This phone is being touted as an updated entry level phone on a par with the 520 as it was in its day.
I've bought it because I own a phone as a tool, it does a job for me regarding my work and I use a camera/video a lot in my job too.
I need a phone to tick a number of boxes for the minimum spend and up till now that phone was a 520 (which I still own).
This has come along and ticks all my 'would be nice to have' boxes aswell so was a no brainer given its cost SIM free here in UK.
Any smartphone in the UK that is under ?100 to own outright without carrier lock is going to generate interest and the spec will generate revenue.
If you currently have a top end phone I really don't see how going from one end of the spectrum to another would even flag in your mind as an upgrade?