I have lake's top end model and really like them. I can compare them to the current S-works shoes and Sidi's dragon model, both of which I own.
The S-works are by far the lightest feeling on my foot. They also seem to work really well with egg beater pedals, better than any shoe I've used before. My only guess is the rubber is the perfect height so the wings of the eggbeaters don't dig in to the sole of the shoe. They breathe well, and fit OK. They are pretty low volume, especially compared to the lakes. Definitely narrower up front. The inside is not soft, far from it, so if you tend to walk very often for whatever reason, these are not such a great choice, imo. The tread is more like plastic and less like rubber so traction is not the best. The tread also feels narrow under my foot so it's more likely to twist an ankle, imo compared to some shoes I've used. I had some major blisters on my heels after a 100 mile race I did on my single speed where I was forced to walk on occasion up technical, steep terrain due to the unfriendly heel cup material. When it gets sweaty it slips, at least when walking, and is rather abrasive.
That said, if you never dismount and want a light, stiff feeling shoe the s-works will suit you fine.
The Sidi are great shoes and feel just like my ergo 2's I use on the road. They are heavier than the S-works by quite a bit. They feel like slippers, have great ventilation, and have decent tread. I rate them in between the lakes and specialized in that category. More rubber-like feeling but still narrow leading to instability when walking in nasty areas. Great shoes, cost too much, especially compared to other companies top end offerings.
The Lake's are amazing feeling shoes on my feet. The interior of the shoe is soft and forgiving and the padded tongue is excellent. They ventilate very well and maybe that "outlast" tech on the insides really does work as my feet are super happy inside them in all conditions. I really like the soft, supple leather and the custom fit. The sole is plenty stiff just like the other two shoes above. They are a tiny bit lighter than the Sidi, but heavier than the S-work shoes. I want to say about 50 grams per shoe difference, but I just cant remember the weights of all the shoes off hand. The tread is excellent, hiking boot material excellent - tacky, soft rubber that grips well in all conditions. It's also wider and thus they feel very stable. For this reason alone I wear them almost always now. it certainly helps that they are the most comfortable of the bunch, too!