Yes, I own the 740c, and not the 840c. I have heard them both, so have Amitnoida and we agree, as far as I understood. Despite the difference in the DAC chips the sound is very similar. If anything, I liked the 740c slightly better, somehow I found more musicality in 740c than in 840c which may have more details (no lack of details in the 740c either).
Arj, I have not liked the sound of all CA CDPs upto 640c (of course comparatively speaking). The 740c and 840c sound is in a different league and at their current prices (55K and 70-75K) I think they are steals and it IS unfortunate we do not talk about them at all in this forum. People who want to set up entry level systems talk only upto the 640c (I think there are better alternatives at that price), and people who want to spend more do not talk about or show any interest in 740c/840c probably because of the budget name (I do not see anybody even trying to audition these). Sorry if I have offended anybody by saying this.
I have recently heard a number very good set-ups in Mumbai, and almost all of them use CDPs (one unit or DAC+transport) which are cost-wise above or way above what I paid for my CDP. I know I have decent amp and speakers (that I am extremely happy with), but my CDP could have been a spoiler. After the comparison of my system with these systems in Mumbai, the least I must say is that my CDP is not spoiling anything for me.
I think people should give these CDPs (740c and 840c) a serious listen and then decide.
Mitul, the 55K price is the list price for the 740c. The 840c is 20K more than that.