I accidentally bought a fiction Topaz book the other day. It looked horrible on my Kindle. I thought it was a mobi file because it has a file size on the buy page. I guess not. I tried importing into Calibre and the results were just as bad. I try not to buy Topaz but afterward I found the book was not available in any other digital format on the net.
After reading up I finally found a better solution. I extracted the SVG images then used this program called Prince to convert them to pdf files. I then merge them in Acrobat Pro and cropped it to just the text then used my OCR software and imported into Word. It worked wonderfully! It kept the italics, bold and format.
The only thing you lose is the pictures but you can add those in manually.