Yes I did. It seems that the pixel in the VR headset (Vive) are not enough to make text readable in a real-scale level. If you want text to be readable you have to make it quite large: e.g. 10cm in ue4 units and look from it at a distance of circa 1 meter. We need another generation (e.g. 8k VR sets) for text to be quite readable on a real-life scale such as an A4.
Besides that you need to set the mip gen settings to no mimaps en look arround in your post processing settings: bloom, auto exposure, blurs.
What I also found as an effective method is to play around with the anti-aliasing. There are serveral options which affects small objects with few pixel (like letters). In my case it was most optimal to use no aliasing at all.