You have to see an XJR-15 in person, to believe how beautiful they really are. Small, sleek, graceful, etc.
They seem to be doing 200MPH, while parked.
Ultimas certainly have a niche in the replica market, and have great performance for the money, but pale by comparison. They have kind of an awkward appearance.
XJ220s are way cool but much larger.
XJ13s are beautiful cars, but a bit too nostalgic looking
for my tastes. They are THE coolest "nostalgia" car, second only to you know what(GT40s)!
Just my personal opinions.
Bill