I recently purchased a Retina MBP along with a 29" LG Ultra wide monitor which is 2560 x 1080. I first connected it using a mini DP to DP but the picture was very washed out. I tried the HDMI (even though some of you said it doesn't do the whole 2560 x 1080 resolution) and to my surprise the colors were accurate and the resolution was listed as 2560x 1080 in system pref. Althought the resolution says it is 2560 x 1080, text seems to be a little fuzzy. If I use it for a while my eyes get used to it, but I had my girlfriend come take a look and right away she asked why the text fuzzy. The monitor is about 100 dpi so I'm not sure if this is actually how the resolution is supposed to be or if there are some adjustments I can make. Any help is greatly appreciated. I'm attaching two screen shots.