What I meant was that it requires much more time and effort to create high resolution and very varied textures for a game so large such as the Witcher 3. The smaller the game is, the easier it is the achieve higher visual fidelity.
What DICE are doing BF1 is impressive however of course.
Oh don't be so sure about that. You probably have missed these.
On the VGX trailer the second combat scene at 1:01
On the debut gameplay at:056 a village in Skellige
On the debut gameplay at 0:58 the market place. On this one you can see the differences and I have to warn you that this gif can cause you severe anger.
If you have downloaded the uncompressed videos you can watch HD textures in all their glory.