And don't forget ambient sensor (which i miss very, very much on Urbane 2) and new Snapdragon processor, which is apparently more battery friendly and faster.
The downside is definetly the looks. For me Urbane 2 is still the most beatiful of all smartwatches on the market, and the LG Sport looks very plain to me.
For me looks are very important, so i will definetely stick to Urbane 2.