"Masterpieces of Illumination: The World's Most Beautiful Illuminated Manuscripts from 400 to 1600" is essentially a reprint of "Codices illustres: The World's Most Famous Illuminated Manuscripts 400 to 1600." The former is one of many 25th anniversary Taschen editions, and bears the series logo on its dust-jacket and bright green cover (rather than the classier illumination of the Limburg Brother's Anatomical Man that adorns the cover of the latter). "Masterpieces" is also slightly smaller (9 ¾" x 12 ½") than the original (10 ¼" x 13 ¼"). There are a few other slight differences between the two editions: different endpapers; white paper for the appendix in "Masterpieces," ivory in "Codices"; and slightly darker illustrations in Masterpieces (only noticeable if you actually compare the editions side by side). Otherwise the two editions are virtually identical.
This is a truly wonderful book. It contains discussions and representative illuminations from 167 of the most famous and influential extant codices, books of hours, psalters, Bibles and histories from Europe and Asia (23 or the 167 are from Persia, turkey and India) during the 1200 years in which manuscript illumination flourished as an art form (and at the end of the text proper are samples from yet another 29 manuscripts). The full-color and often full-page illustrations are beautifully and accurately rendered, and the accompanying descriptions are both authoritative and unusually informative. The appendix contains artist biographies, along with a comprehensive bibliography, glossary, and index. In short, this is more than just a coffee-table book; in fact, I use it in my university course on manuscript illumination (along with Christopher De Hamel's excellent "A History of Illuminated Manuscripts," which forms the perfect companion piece to this volume.).
If you only read one book on the subject of manuscript illumination, this should be the one!