Best fix Lumia, and wait one month. P9 Lite is getting released very soon followed by Honor 5C. So prices are expected to drop.
The special thing about Lenovo is their splash-proof nano coating, that makes them slightly water resistant. Almost all of their phones have that coating. They are very good and durable overall, but many of the Lenovos i came across have under performing camera for their price, rest they were very good.
K5 Plus is a good phone, but its camera is not good as others, like Galaxy J5, P8 Lite, Z12, OPPO F1 etc. In dim lights, its camera is not good as others. So i would not suggest getting that if good camera is your requirement.
P.S, do not worry about Full HD displays. Normal HD displays are perfectly fine for most users in this price range. Having a better camera is more important than FullHD displays btw!