[DrifterX]

2018 is the refresh year for any 4 Series so you're already going to be getting the latest - I wouldn't expect much of a change for another 3 years.

If you don't need the size of a 5 Series, I recommend going for a 440 GC with an MPPSK (M Performance Package II when ordering in Canada). I'm pretty sure you'll experience the difference from your current vehicle if you drive one with that package. Both get digital clusters, both get the new iDrive except the 4 Series doesn't have the gimmicky hand gestures, both have all the driver assistance features available. 5 Series has that bulky key where you can tell your car to automatically park and provides stats which you can get on your phone with the BMW remote app. The tech alone isn't worth getting a 5 Series as I don't think the difference is justified compared to the price difference.

A fully loaded 4 Series GC with the LED headlights & M Sport/Performance package looks way nicer than a 5 Series but that's just my personal opinion.