Let's talk about exotic lenses.
What a cute kitty. Taken with a Sony full frame body and a Meyer Optik Diaplan 100mm F/2.8. The Diaplan was sold as a projection lens, so it lacks an aperture. It's nearly identical to the Meyer Trioplan 100mm F/2.8, which is very expensive cult lens. The appeal of both is the "soap bubble" bokeh they produce. I am not convinced. Historically, Japanese photographers (the obsessive nuts who coined the term "bokeh") look down on strong rings on OOF highlights. They call that "nisen bokeh" and view it as a bad thing. I tend to agree with them. The Trioplan is a meh lens that's soft and not terribly contrasty wide open, and only okay once stopped down. There are far cheaper lenses with modern build quality available for a fraction of a price.
To wit: There's a clean Trioplan 100mm F/2.8 on the 'bay right now, with its original carrying case (also clean). Seller wants $850. Bro, you can buy a real lens for that kind of money. Goddamn vidiots have driven up the price of old manuals to insane levels. [Knuckles, please not another vidiot rant.] Also on the 'bay is a completely new TTartisan 100mm F2.8 in M42 mount for $155 shipped. Don't be too surprised if I buy one of those in a couple months.
On the other end of the spectrum:
Mercedes car show. Taken with a full frame Sony body and their 14mm F/1.8G. That is a $1500 lens, and dare I say it a bargain for what it is. I'm not super familiar with Sony bodies, but their lens lineup is pretty spectacular. They make a 135mm F/1.8 that's superior to the legendary Canon 135mm F/2L. It's sharper and has (on paper) better color transmission.
Snow in Yakitori Alley by Ben Torode on Flickr. Sony 135mm F/1.8 wide open.
They also make a number of killer 35mm primes (my favorite focal length) including a $1200ish F/1.4, a significantly cheaper 35mm F1.8FE, and a Zeiss designed 35mm F/2.8 Sonnar.
Sony 35mm F/1.8, wide open by Steven Kramer on Flickr.
Alfa Romeo in Vancouver, taken with a Sony body and 35mm F/2.8 Sonnar, stopped down a bit.
Bonus:
Taken with the Sony FE 16-35mm F2.8 GM at the wide end. Giving the Canon 16-35mm F/2.8L a run for its money.
This is an audio snob site (at least on paper), and Sony's (to quote Kevin Gilmore) wireless drive-by-wire management is the stuff of legend. With that said, they are also an enormous company, and utterly dwarf Canon and especially diminutive Nikon. When they, you know, actually bother with their products they punch so hard it's scary.