Like Samsung Galaxy S III and Galaxy Note II, ThL W5 and ThL W6 have their own characters. ThL W5 is equipped with a 4.7-inch Retina IPS touch screen, and the ThL W6 adopts a 5.3-inch huge QHD touch screen. It seems that ThL is for the general group, but the ThL W6 is for the businessmen specially. The main difference between them should be on the display. For ThL W5, it is provided with a 720P (1280 x 720 pixels) Retina IPS screen, which can show the users wonderful display effect like the Samsung Galaxy S 3. As to the ThL W6, its display is very common, just a QHD (960 x 540 pixels) touch screen. With those figures, we can say that the display effect from ThL W5 must be much better than that of ThL W6 abstractly at least.
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Source:ThL W5 vs. ThL W6