The important thing you need to know about this style boot is they RUN TIGHT AND SMALL!  I wear a 7  and I am a petite person and they were so uncomfortably tight.  Other than that they were just beautiful.  I read more reviews online about these boots and many said that the  wide calf Bollo 2 is no different than the regular Bollo knee high boot. Taking this advice, I went back to Amazon.com and saw that this regular Bollo style ran from $179.00 as opposed to the $248 for the Bollo 2... Bonus!  I assumed that the price was determined by availability of stock or popularity of color.  (Not so)...  I opened the box and was confused to see my designer boots in a plain shabby brown boot box with tissue paper...?  No careful packaging in a Vince Camuto box with the foot stuffed with paper and a plastic shaper like the Bollo 2 order.  This made me question the authenticity of the boots... I closely inspected them to make sure they had the designer quality and brand.  They have the logo on the zipper and inspection tag and sole and are neatly stitched and studded so I do not doubt they are Vince Camuto; However,  I did notice some flaws in the dye and a few scuffs.  I am guessing that the boots are SECONDS.  The flaws in the stain are minor and no one will see them when I am wearing them, but I think that Amazon should state that the boots are seconds!  The boots with shipping cost $188 and for that price there needs to be some clarification to the consumer if they want to spring the extra money for 'totally perfect' boots or take as chance on seconds. As far as the fit, this time I ordered a 7.5 and they fit great in the foot but the calf is tight.  I am hoping they stretch out, but I will need to wear them with leggings or skinny jeans and thin socks for a while.  If you have large calfs this is not the style for you.
Bottom Line: No difference in calf width with the two styles; expect less than perfect boots for $179 instead of $248. Unique style is a tricky fit to zip into and are not a good fit for big calfs.  Upside: Quality product with unique features and fast shipping from Amazon.