The comparison in common is the feel they both feel pretty similar but the tone from the 67 is nice and meaty kinda in your face grunt and girth, The Bach is a little more subdued and mellower but I'm sure it's the Artec's or the electronics. Don't get me wrong the Bach sounds good and sits well in the mix it's just missing something the 67 has.
The Lull is just plain ole nasty, I'm calling it my Marshall killer. I can play any genre of music with that bass and it finds it's place. The Bart pre (I was really never a fan) really shines on this bass and takes it to a whole new level of tone shaping.. I can make it sound like the Orville, The 67 or Bach, Then I can twist a few knobs and get a great Jazz bass burp tone or monster P tone, Very Versatile bass. I love it.