I agree with Chuck. For the same reasons, I only have the Canon as a secondary 10x bino. It's not just the weight of the Canon but more importantly it's huge and ungainly bulk and potential fragility.
The Canon does however offer a technically stunning view. From my experience, as a Swarovski owner and admirer, overall I would place the Canon above the SV10 optically. It is slightly sharper at the edge of the FOV than even the Swarovision, which in turn is sharper in the outer periphery than anything else I've used. A flat field and resolution at absolute field edge has become something of a holy grail around here, and for many is the SV's 'raison d'être'. The Cannon is better.
Some folks seem to enjoy viewing in the outer periphery (its not for me), or enjoy novelty viewing such as splitting double stars on the absolute edge of the FOV (I did this once but never since) - the Cannon is your tool for this. Part of the irony of the 'IS' Canon is that If your visual acuity is up to it, turning off the otherwise brilliant IS and fully bracing or tripod mounting the Canon brings out yet a further increase in resolution. From my experience, The Canon will effortlessly resolve alongside any alpha binocular on the market today. I spent a day doing comparative resolution testing very recently with Swarovski SV, Noctivids, various newer Habicht, Nikon, Zeiss and Fujinon - and the ease and pace at which the Canon 10x42 pulled full resolution on my particular target was incredible but not unexpected. The Canon deals with flare and glare far far better than the Swarovision. I haven't done night time testing between the two, but at sunset, dusk and deep dusk the Cannon is a far far superior instrument due to its ability to control glare. I haven't compared the Canon to the Noctivid in this regard, but the Canon has been my previous 10x benchmark for viewing in challenging light.
So, the important factors in the cannon's favour - the perfectly weighted silky smooth focus, the effortless clarity, superb glare control, the big APFOV which is essentially all sweetspot, and the brilliant IS system which brings out instant detail which unbraced alpha binoculars can only dream of. On purely optical merits, the Canon is a very formidable instrument.
The reason I don't use the Canon so much is that (almost unconsciously) I do elbow, hand and head brace for a good majority of my viewing, so the Canon loses its IS advantage, and I therefore nearly always end up using a far smaller and lighter and more convienient and robust binocular. I also prefer the image aesthetic/beauty through other bins such as the Noctivid, but this is highly subjective, and others may prefer the 'beauty' of the Canon view. Something else I'm not so keen on is that to me, the Canon looks and feels like a cheap and nasty bulky plastic kitchen appliance purchased via a telemercial. Once again, just an opinion, and completely meaningless when viewing!
Happy binocular hunting.